Hi @Nico Felten ,
Did you receive any error messages during this time? Please try reinstalling Report Builder, and if the issue is not resolved, please attach the error message as much as possible.
Also, try using Process Monitor to capture the information. Process Monitor is an advanced monitoring tool for Windows that shows real-time file system, Registry and process/thread activity. For more information, see: FIX REPORT BUILDER CRASHING ON LAUNCH!
Best Regards,
Joy
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