ribbon bar acess crashing when called from a thread

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MFC

hi, i using vs2010 and my app has a ribbon bar

all is working find in the main thread, i can get the ribbon object pointer, use FindByID to get ui elements and read and modify them as necessary

however, when i have another thread running (midi playback thread in this case), any type of access to the ribbon crashes, well most of the time, sometimes its works!

very strange. any idea why an MFC app would crash which accessing the ribbon in a thread?

thanks