The pointers to MSXDataRec are probably being deallocated at the end of the call to the MSX DLL, since there's no point to keep it around. It's not a threading issue. You're not supposed to be holding onto pointers, since they're not guaranteed to still be there in a different call.

You'd be better off saving the actual data you were passed instead of a reference to it. Then you could access that data as much as you like.

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