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It turns out that some bluetooth devices that advertise themselves as "Cambridge Silicon Radio" actually use a chipset made by Accel Semiconductor. These devices do not work in Linux, and cause the symptoms described in this bug. Try opening the case on one of the dongles with a screwdriver, and looking for markings on the board. If there is a marking that contains a number beginning "AS3620QA", then this device contains a chip made by Accel Semiconductor. These devices do not work on Linux at this time. I don't know whether or not anyone is working on a driver for these, but the CSR stuff will not work, although it may appear to be partially or intermittently operational.
Mark.