2008R2: Running rsop I get no result but error "invalid property"

Hi experts.

Unfortunately, I have no idea, when or how this started, because I haven't used rsop in a while: while this file server (2008 R2 SP1) is in excellent condition (event logs clean, no other problems), it is not able to display rsop data.
rsop.msc fails with the error message "invalid data", while gpresult /h %temp%\result.htm fails with "access denied" - please note that this command was launched from an elevated command prompt.

Note: the gpupdate is possible and succeeds.
Monitoring with procmon, I see no access denials at all, so I have no clue, what is going on.
Only tried sfc /scannow - no inconsistencies found.
Googled - found literally no one with this very problem.
Tried rsop from the server GPMC - same error.
Had a look at wmimgmt.msc ->properties - security - rsop and subfolders: all seems normal.

Any idea?
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Check the below link it looks like the issue you are facing. It may help you.

McKnifeAuthor Commented:

That "trick" is not explained at all - I would not want to run commands that are not explained.
But anyway, already reregistering the userenv.dll fails: "module ...userenv.dll loaded, but Dll install procedure entrypoint  was not found - make sure it's a valid .dll".
McKnifeAuthor Commented:

News: I converted that machine to a vm and unjoined it from the domain to do some tests and rsop+gpresult /h work again. Monday I'll join it again with a different name but same GPOs and see what's next.
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McKnifeAuthor Commented:
Well, what should I say... rejoined it, same OU... same security groups as the cloned server... works. Weird. Will try to unjoin/rejoin the original server soon.
McKnifeAuthor Commented:
Finally had the time to do it. Disjoin/rejoin solved it.

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Windows Server 2008

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