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After further research, it looks as if the lock-up in Baldur's Gate is being triggered by an unsupported API Call.
Here is the pertinent error message from Wine:
fixme:ddraw:DIB_DirectDrawSurface_Blt dwFlags DDBLT_WAIT and/or DDBLT_ASYNC: can't handle right now.
This fixme is only encountered during game 'movies' (including resting and death scenes).
I have a full logfile if anyone is interested.
Ian