The thing that happens in there is that it calls findFileExtensionsForCoreAudioCodecs(), which asks the OS for all its codec formats. On my machine, that spews out a heap of debugging that indicates that the OS is loading/testing all the codec modules that it can find. It could be that one of the codecs on your machine is doing something funny to the stack or otherwise confusing the debugger. But I don't think this is a "real" bug, just the debugger struggling to cope.
Yeah, It’s just a pain in the rear… 'cause if I have that function call anywhere in my plugin and try and debug unrelated code somewhere later (in a completely different scope) the debugger is still “off”.
Of course just running the program is fine – this is purely a debugger issue… I’ll just keep line 66 commented out while I debug.