So I tested a other Win XP 32bit Pc, exactly the same problem.
It always stopped at line 150, with or without a license.
In summary, at two different Win 7 ultimate Pc's it runs perfectly to the end, with and without license and at two different Win XP 32bit Pc's it always stopped at line 150 with and without license.
Mach 3 should stop in the demo version after 50 lines of code, but I continue to line 150.
My guess is that I have a problem with the license. maybe you have more ideas and solutions.
Regards racer2012