There are three weeks that I am receiving some reports about the error: In sites that were working fine.
The error is:
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.
It happens in views of lists.
Do you know if there are something happening? Like a update that messed everything? And if there are some fix?