I’m sure this is something simple, but it seems the latest patch from Microsoft has broken my SP2013 reporting services:
 We are going through the logs now, but it looks like some kind of access issue. Has anyone else seen this?
Pat
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Can you use powershell to set the SPLogLevel to Verbose, perform an action to generate the error and then post the logs here in your post. Dont forget to run the clear-sploglevel cmdlt after you are done. This will set diagnostic logging back to defaults.