I just installed MBC over the weekend and it seems to work OK, so I thought I'd try MBT. The only significant problem I've had is that my Harmony 640 remote, which is setup to work with MBC does not work in MBT.
I have a Hauppauge WinTV HVR-1850 (Model 85xxx, Combo ATSC/QAM, 888 DIF) and I'm using the IR receiver and driver that came with that.
When I install MBT, the remote stops working in both MBC and MBT, if I "Restart IR" (a Hauppauge utility) the remote then works in MBC, but still not in MBT. This is true even if I run both MBC and MBT at the same time, switching between them, the remote works in MBC but not in MBT.
I've attached my most recent MBT log, if that will help.