I’m having a problem with my Calendar datepicker in Sharepoint 2013. It’s like it is missing some CSS.

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And I get the below error in my console :

Resource interpreted as Stylesheet but transferred with MIME type text/html: "http://hub-pilot.com/programs/ftmba/2016/_layouts/15/defaultcss.ashx?ctag=21". iframe.aspx?&cal=1&lcid=1033&langid=1033&tz=-08:00:00.0003650&ww=0111110&fdow=0&fwoy=0&hj=0&swn=Fal…:5

A solution I have tried, but did not work is as follows:

  • Placing Master Page in same folder of masterpage

I have all my styles/layouts/css/js in a separate folder in the masterpage folder. I have this working on one site collection, but for some reason it is not working on this separate one.

Any thoughts?


2 Answers 2


Try creating a root(/) site collection in the web application and see if it fixes the problem. I have seen this issue with SharePoint 2010 under certain situations.

  • I've seen this as well when certain Javascript and CSS files don't download correctly. Have a look at the resources being called and loaded when the page opens. If that is the case you may have a bad cache somewhere (SP servers, or Load balancer) that you will need to clear. Commented Mar 30, 2015 at 15:56

It looks you created your own master page. Use GhostableInLibrary type in Elements.xml and reactivate feature which includes this master page.

File Path="My.master" Url="My.master" Type="GhostableInLibrary" ReplaceContent="TRUE"

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