Hi @tom geo ,
I did some research online that a few people also had the same issue.
They mentioned that with Process Monitor (procmon) showed ReportingServicesService.exe getting an ACCESS DENIED error for the following key. This key is only accessible while SSRS is running and disappears when it is not. Changes made to its permissions are retained.
Computer\xxxx\xxx\Software\Microsoft\Avalon.Graphics
You may grant the execution account (not the account that runs the service) Read access to this key to see if the issue can be resolved.
Regards,
Zoe
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