diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index 737a3fc5f0..3d79874d6f 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -2078,7 +2078,7 @@ var addExtImage = {
 			return false;
 		}
 
-		document.getElementById('status_img').innerHTML = '<img src="<?php echo esc_url( admin_url( 'images/wpspin_light.gif' ) ); ?>" alt="" width="16" />';
+		document.getElementById('status_img').innerHTML = '<img src="<?php echo esc_url( admin_url( 'images/spinner-2x.gif' ) ); ?>" alt="" width="16" height="16" />';
 		t.preloadImg = new Image();
 		t.preloadImg.onload = t.updateImageData;
 		t.preloadImg.onerror = t.resetImageData;
diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 757f22834b..b42205687f 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -1504,7 +1504,7 @@ function _admin_notice_post_locked() {
 			<div class="post-locked-avatar"></div>
 			<p class="wp-tab-first" tabindex="0">
 			<span class="currently-editing"></span><br />
-			<span class="locked-saving hidden"><img src="images/wpspin_light-2x.gif" width="16" height="16" /> <?php _e('Saving revision...'); ?></span>
+			<span class="locked-saving hidden"><img src="<?php echo esc_url( admin_url( 'images/spinner-2x.gif' ) ); ?>" width="16" height="16" /> <?php _e('Saving revision...'); ?></span>
 			<span class="locked-saved hidden"><?php _e('Your latest changes were saved as a revision.'); ?></span>
 			</p>
 			<?php
diff --git a/wp-includes/css/wp-auth-check-rtl.css b/wp-includes/css/wp-auth-check-rtl.css
index c418b4e7e0..888d4323a8 100644
--- a/wp-includes/css/wp-auth-check-rtl.css
+++ b/wp-includes/css/wp-auth-check-rtl.css
@@ -40,7 +40,7 @@
 }
 
 #wp-auth-check-wrap #wp-auth-check-form {
-	background: url(../images/wpspin-2x.gif) no-repeat center center;
+	background: url(../images/spinner-2x.gif) no-repeat center center;
 	-webkit-background-size: 16px 16px;
 	background-size: 16px 16px;
 	height: 100%;
diff --git a/wp-includes/css/wp-auth-check-rtl.min.css b/wp-includes/css/wp-auth-check-rtl.min.css
index cb6ae07ff0..369d1297e7 100644
--- a/wp-includes/css/wp-auth-check-rtl.min.css
+++ b/wp-includes/css/wp-auth-check-rtl.min.css
@@ -1 +1 @@
-#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;right:0;left:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;right:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 -190px 0 0;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/wpspin-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%}#wp-auth-check-wrap #wp-auth-check-form iframe{height:100%;width:100%;overflow:auto}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;left:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
+#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;right:0;left:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;right:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 -190px 0 0;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/spinner-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%}#wp-auth-check-wrap #wp-auth-check-form iframe{height:100%;width:100%;overflow:auto}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;left:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
diff --git a/wp-includes/css/wp-auth-check.css b/wp-includes/css/wp-auth-check.css
index 45025dbf81..b6dd541c22 100644
--- a/wp-includes/css/wp-auth-check.css
+++ b/wp-includes/css/wp-auth-check.css
@@ -40,7 +40,7 @@
 }
 
 #wp-auth-check-wrap #wp-auth-check-form {
-	background: url(../images/wpspin-2x.gif) no-repeat center center;
+	background: url(../images/spinner-2x.gif) no-repeat center center;
 	-webkit-background-size: 16px 16px;
 	background-size: 16px 16px;
 	height: 100%;
diff --git a/wp-includes/css/wp-auth-check.min.css b/wp-includes/css/wp-auth-check.min.css
index 1a109a4670..f4ed4a3656 100644
--- a/wp-includes/css/wp-auth-check.min.css
+++ b/wp-includes/css/wp-auth-check.min.css
@@ -1 +1 @@
-#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;left:0;right:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;left:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 0 0 -190px;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/wpspin-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%}#wp-auth-check-wrap #wp-auth-check-form iframe{height:100%;width:100%;overflow:auto}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;right:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
+#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;left:0;right:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;left:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 0 0 -190px;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/spinner-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%}#wp-auth-check-wrap #wp-auth-check-form iframe{height:100%;width:100%;overflow:auto}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;right:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 1feec50e95..b953ee3fb9 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31186';
+$wp_version = '4.2-alpha-31187';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.