Hello all,
I think, I also noticed this phenomenon in the past:
After modifying the G-Code file (even from inside Mach3 with the "Edit" button) the small toolpath window refreshes automatically and shows the changed toolpath, but the big one does not. You have to refresh it manually to see the contents correctly.
Might this behave different depending on graphics board in the PC? (I don't have an idea, as I don't know how and where the toolpath displays are generated.)
Maybe this point should be on the task-list for revision 4.
Konrad