Ok, it sounds like something happened to the printing preferences. What you can try here is resetting this within QuickBooks. Try bringing up a Check that you'd...
Do you have another computer you can access your company file from and try printing as well? If not, does this system have another Mac OS User you can log in as...
Ok, the update that was released that allowed printing again with custom sized paper was for printing a single use check. So on the Print Check window if you ha...
Is it still crashing when you try to print checks, or can you not choose to print single checks? If it's crashing, did you send in the crash report for this? De...
