When the usual debug tools fail, the best approach is to run from source and stick in a few print statements. Since your problem seems to be splash screen related, look in gui2/main.py around line 180. And gui2/ui.py around line 338
Add in some print statements to see where it is getting stuck. You will need to redirect the prints to a log file, since on windowd gui programs have no working stdout, like this
print ('whatever', file=open('/path/to/log/file.txt', 'ab'))
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