Thanks for responding so quickly!
I'm running V11.45. This version and several before this will either freeze or fully crash during export (no error messages but when the program is restarted it asked if I want to use the auto-save project). I've tried at least 5 versions before V11.45 with the same results.
My desktop is 1 year old....11th gen Intel i5 and build in intel graphics 730 (updated to latest driver). RAM is 8 I believe.
What is the default setting using? CPU and GPU at the same time?
So I guess there is no harm in exporting a project and try all 3 settings to compare?
Thanks