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3DS Max trouble with SDK

Hello everyone,

yesterday all of a sudden between closing a completely functional MAX and a starting it again 15 minutes later something must have gone wrong here.
I get the following message but have changed nothing on the entire system (just did a quick check of the last export in P3D):
Of course the material export or the shader tool are not working any more. It does not matter if I use the english or german version of Max.
Even after uninstalling the SDK and removing the plug-in from the Max third-party logins the "Prepare3D Tools" remains in the menu bar but is not functional with a corresponding error message.

Does anyone know what is going wrong here?

Thanks in advance!



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Problem seems to have changed slightly after a complete clean install of 3DSmax...
2022-06-21 (1).png

2022-06-21 (2).png

Meybe some knows what to do? Development is complete on hold for weeks now as I cannot work with this problem...