Just to confirm we know about this issue and are currently working with Adobe to fix – it’s high priority for them at this point.
The issue started appearing with 18.0.0.232 Flash update (and is further present in FP 19 beta). Unfortunately it causes apps running with FW to crash the whole Flash plugin, on OS X in particular (but we had a report from Windows as well).
We’ve been working hard since last Friday to provide a minimum crashing example to Adobe to accelerate the debug proccess – that example was sent yesterday and we’re still actively looking for any kind of workaround. Note that the crashing example does not contain any FlashyWrappers code. Which means it confirms, those crashes are not caused by FW in the first place (even if there was a faulty code though, Flash should not crash). So far the crashing seems to cease or at least minimize itself if FW is in non-realtime mode (or not using multithreading in 2.3). Also no crashes for earlier Flash Player versions.
This issue is pretty big so as you can imagine it has delayed the next FW 2.4 release until this is 100% resolved & confirmed to be resolved by our customers.
The bug should not affect AIR as it seems connected to Crossbridge (Alchemy) and Adobe’s changes to that in 18.0.0.232, where they were fixing other Alchemy related issues. Crossbridge is a cross-compiler used to build FW for Flash.