I've had stuck notes occur with my MiniBrute SE, hooked up to the BSP over MIDI. I've had a VirusB and Korg/Arp Odyssey hooked up too and am fairly sure I haven't heard it with them.
From a tech standpoint, it may be a problem with the MIDI implementation on the BSP using the MIDI spec's "Running Status" or the different ways of specifying NoteOff in a way the 'Brutes sometimes can't handle.
Or, there just could be issues where Note Off events end up not being output by the BSP, perhaps when looping patterns with TIEd notes.