Error showing Developer Dashboard in SharePoint Foundation 2013

Hi everybody,

we have a SharePoint Foundation 2013 farm with SP1 and CU Nov 2014 applied (15.0.4667.1000). We have enabled developer dashboard and when we try to open it a new browser window appears with the followed error:

Server Error in '/' Application.

Cannot make a cache safe URL for "microsoftajax.js", file not found. Please verify that the file exists under the layouts directory.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: Microsoft.SharePoint.SPException: Cannot make a cache safe URL for "microsoftajax.js", file not found. Please verify that the file exists under the layouts directory.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[SPException: Cannot make a cache safe URL for "microsoftajax.js", file not found. Please verify that the file exists under the layouts directory.]
   Microsoft.SharePoint.Utilities.SPUtility.MakeBrowserCacheSafeLayoutsUrl(String name, Boolean localizable, Int32 desiredVersion) +1456
   Microsoft.SharePoint.WebControls.ScriptLinkInfo.ToScriptUrl(Page page) +663
   Microsoft.SharePoint.WebControls.ScriptLinkInfo.ToScriptBlock(Page page) +23
   Microsoft.SharePoint.WebControls.ScriptLink.RenderScriptBlockInline(Page page, HtmlTextWriter writer, Boolean deltaPage, StringBuilder sb, ScriptLinkInfo s) +109
   Microsoft.SharePoint.WebControls.ScriptLink.RenderScriptBlockInternal(Control ctrl, Page page, Boolean afterUI, HtmlTextWriter writer, Boolean deltaPage) +1027
   Microsoft.SharePoint.WebControls.ScriptLink.RenderScriptBlock(Control ctrl, Page page, HtmlTextWriter writer, Boolean afterUI) +58
   Microsoft.SharePoint.WebControls.ScriptLink.Render(HtmlTextWriter writer) +226
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +150
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +249
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +49
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +150
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +249
   System.Web.UI.Page.Render(HtmlTextWriter writer) +40
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +150
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5120

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.19449

This error is reproduced in all our enviroments, which has applied the same level patch.

Is this a SharePoint bug?

Regards,

Sergio Calleja