When Tunercat OBD-II tuner came out around 2002 GM flashes in most cases were only 512K bytes and that was for PCM and auto tranny
Now GM calibrations are like 4 mg bytes and that is each for PCM...

Hi Carl
Thanks for the reply, I think your correct about if MSwindows is 32 or 64 bit, most P/C and laptops are 64 bit and crashes for the editor seems to crash very easy then if using a older P/C...

Hi Dave, thanks for the reply

I see your using different software the RTT which is different coding then the
OBD-II Tunercat software I use so problems may be different but shows common faults...

This problem has been around since Windows XP and gotten worse with newer Windows like 7, 8.1 and 10

The larger the flash file is (newer the vehicle is) the more apt some type of failure occurs...