Ah, OK. I’d be willing to bet that Panda’s FMod audio layer (and its OpenAL audio layer, for that matter) doesn’t properly protect itself against multithreaded access.
Both of these were originally implemented by people who likely weren’t thinking in terms of multithreaded code.
I’ll put it on the list to investigate. In the meantime, one easy way to assure yourself that it is, in fact, strictly related to the audio subsystem is to run with “audio-library-name null” in your Config.prc file.
David