There appears to be an error when trying to view Health Reports from Central Administration. A simple fix within a SharePoint Stored Procedure fixes the problem. I get the error message "You can only specify the READPAST lock in the READ COMMITTED or
REPEATABLE READ isolation levels." when just trying to click "View Health Reports" --> Go in CA.
I have found the same problem in some blog posts which leads me to believe this is a bug:
Problems Viewing Health Reports in SharePoint 2013
From the blog post "I managed to work around it by altering the proc_GetSlowestPages stored procedure and commenting out theWITH (READPAST) line. "
This also worked for me. It would be great if a fix could be released for this problem as it seems to cause other problems as well (site analytics freezes).