Check this thread at xda-developers:
http://forum.xda-developers.com/show....php?p=2111998
--might need to check your bluetooth system and sharing preferences - corrected my inability to transfer from phone to iMac.
Also, for transferring from my iMac to the Mogul, this program seemed to help me, though I'm not sure it's necessary:
http://hejhej.org/downloads/moBlue/
I don't have MissingSync installed, though I do have the free version of SyncMate, but I don't believe either program is required for basic BT file transfer.
Hope that helps, --TonyKovac