Funny thing, this has come up again, and this time it is as Joe Huber mentions, a BEX crash on quit. I checked out Joe’s Feedback case 47409 and it is very similar to what I’m seeing, but my exception code is not c000000d but rather c0000005 which according to https://msdn.microsoft.com/en-us/library/cc704588 is a “STATUS_ACCESS_VIOLATION” … “The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.” I’m using Xojo 2017r3.