Blank screen with created EXE

Hi,
I just finished my first program.
It works fine in BlitzPlus. However, if I create a EXE and start it the screen turns black (and I have to restart the PC).
What am I doing wrong ?

Are you running with debug/try making the app windowed and run debug.

Do you think more information is needed for anyone to help you fix the problem?

Yes, create an executable with Debug mode. That should help narrow down the problem.