RSS Viewer Web part not working after installing kb2767793

Question

Hi,
I just patched our sharepoint farm with kb2767793 - after installing this CU the RSS Web part is no longer loading as expected on our pages, it just keeps trying to load forever.
If I choose to edit the page the RSS feed loads with no issues when in edit mode. When going back to published view I experience the same issue.
The symptom is only present if the page contains more web parts eg Content Query Web part. If I create a page with only the RSS viewer web part it functions as expected.
Has anyone experienced this or has any suggestions? 
Thanks,
Luke

Answer 1

We have the same issue after installing the April security updates.
I opened a support case with Microsoft and they proposed these using one of these solutions (see below).
Unfortunately these did not work for us.
Summary
 Page Level: add a CEWP to the page and add the following custom script to it:
Save the following JavaScript to a .txt file and upload the file to any document library in the root of the site. 
<Script Type="text/javascript"> 
function CustomUpdateFormDigest() 
if(window._spPageContextInfo != null) 
var $v_2 = window._spPageContextInfo; 
var $v_3 = $v_2.webServerRelativeUrl; 
var $v_4 = window._spFormDigestRefreshInterval; 
UpdateFormDigest($v_3, $v_4); 
CustomUpdateFormDigest(); 
</Script>
Adding the above script to the Master Page
3)     Web Application Level:
Turn off Security Validation for the pages from Central Admin -> Web Application -> General Settings.
Gncntry