64-bit build is not quitting gracefully

I’ve got an app that’s running fine as a 64-bit build. The only minor problem is that when quitting, I get a “TitleDriver quit unexpectedly. Click re-open to relaunch the application…”
but of course it’s not unexpected. …and this doesn’t happen in 32-bit mode, so I can’t debug the quit routine.

The crash report contains this:
. . .
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 com.xojo.XojoFramework 0x000000010592bccd 0x1058d9000 + 339149
1 com.xojo.XojoFramework 0x000000010592bd1a 0x1058d9000 + 339226
2 com.xojo.XojoFramework 0x0000000105933dfd 0x1058d9000 + 372221
3 com.apple.AppKit 0x00007fff9b4fa297 -[NSView(NSInternal) _updateTrackingAreas] + 663
4 com.apple.AppKit 0x00007fff9b4fa746 -[NSView(NSInternal) _updateTrackingAreas] + 1862
5 com.apple.AppKit 0x00007fff9bba6a81 ___NSWindowGetDisplayCycleObserver_block_invoke6376 + 1265
6 com.apple.AppKit 0x00007fff9b815169 __37+[NSDisplayCycle currentDisplayCycle]_block_invoke23 + 292
7 com.apple.QuartzCore 0x00007fff8d1b5f71 CA::Transaction::run_commit_handlers(CATransactionPhase) + 85
8 com.apple.QuartzCore 0x00007fff8d1b558f CA::Context::commit_transaction(CA::Transaction*) + 515
9 com.apple.QuartzCore 0x00007fff8d1b50ec CA::Transaction::commit() + 508
10 com.apple.QuartzCore 0x00007fff8d1c0977 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 71
11 com.apple.CoreFoundation 0x00007fff99934067 CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 23
12 com.apple.CoreFoundation 0x00007fff99933fd7 __CFRunLoopDoObservers + 391
13 com.apple.CoreFoundation 0x00007fff99912ef8 CFRunLoopRunSpecific + 328
14 com.apple.HIToolbox 0x00007fff8b500935 RunCurrentEventLoopInMode + 235
15 com.apple.HIToolbox 0x00007fff8b500677 ReceiveNextEventCommon + 184
16 com.apple.HIToolbox 0x00007fff8b5005af _BlockUntilNextEventMatchingListInModeWithFilter + 71
17 com.apple.AppKit 0x00007fff9b3c9efa _DPSNextEvent + 1067
18 com.apple.AppKit 0x00007fff9b3c932a -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454
19 com.xojo.XojoFramework 0x000000010591704a 0x1058d9000 + 254026
20 com.apple.AppKit 0x00007fff9b5e0125 -[NSApplication _shouldTerminate] + 971
21 com.apple.AppKit 0x00007fff9b5df771 -[NSApplication terminate:] + 762
22 com.xojo.XojoFramework 0x0000000105a72d85 RuntimeRun + 203
23 com.invisibleobjects.titledriver 0x0000000105198978 REALbasic._RuntimeRun + 24
24 com.invisibleobjects.titledriver 0x00000001056e2e40 _Main + 480
25 com.invisibleobjects.titledriver 0x00000001056d7111 main + 65
26 com.invisibleobjects.titledriver 0x000000010506afa4 start + 52

Any insight on how to troubleshoot this would be appreciated!

attach the full crash log to a feedback report so we can look at it please

Will do, thanks.