Hi Quinn
I've had no success in following the symbolication instructions - mdfind does not find anything using the UUID in the frames containing the words Caption Pro.
I tried creating an out-of-bounds array access to trigger an exception and the crash log indicated that this was the problem. On checking my log file, there seems to be no possibility of an out-of-bounds array access before the crash occurs, so the origin of SIGABRT is still unclear. I have added a lot more logging, including the created array item count and will resubmit in the hope of getting more detailed info on where the crash occurs. I have packaged the app for distribution to customers and asked a couple of Mac friends to see if they can run it on up-to-date machines. One of them has done so successfully, so the problem the App Reviewer has is still mysterious