Hi guys,
Yesterday I was unpleasantly surprised with an error trying to view a list:
"Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator.
Correlation ID: ....."
After drilling down the log, some investigation, coffee and googling, I found out that this problem is caused by a Windows update, to be more specific; KB2844286. It's a security update but it renders your list (and listview webparts) inaccessible if you've got any custom XSLT going on in there. Uninstalling the update and performing an IISreset on the WFE solved the issue.
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