Filed FB9149772 Thanks, I would send a few more "sample output" images, but the forum software seems to be unable to process them. Maybe there is some sort of size limit. The best I can do is a "good until a few days from now" link: https://share.icloud.com/photos/0FOZkOkSVPzDOpdTkrEKGLqtQ#San_Jose (it is prob. fine that the link won't last long, that image is just me showing off, it has no text, so isn't in dire need of TextKit2 vending a bezier path!)

Thanks. I know about the stack trace, I can see where the memory was allocated, but we are allocating thousands of them per second and deallocation just slightly less then thousands per second (in the same path). So examining the actual leaked objects (in this case I think they are string fragments) seems like the best corse to track down the root cause of not deallocating them (I'm expecting one of the error paths doesn't deallocate everything it had going on, but that code is all C++ and it has been a while since I've crawled around in a big C++ mess and I figured having more information about the error state would be helpful...).