> Do you totally delete c:\Programme\Mixxx each time?
No. I did it just now and installed 1.12 5403 still crashing.
> The build server 1.12 and master build environments are the exact same files
Maybe a hint. Was the environment changed between 1.12 5387 and 1.12 5403? Maybe a test would be nice to build 5387 with the current environment.
> Do you totally delete c:\Programme\Mixxx each time?
No. I did it just now and installed 1.12 5403 still crashing.
> The build server 1.12 and master build environments are the exact same
files
Maybe a hint. Was the environment changed between 1.12 5387 and 1.12 5403?
Maybe a test would be nice to build 5387 with the current environment.