I have MPT 3.25 and an IVT Bluetooth dongle with my V551. My PC can find my phone, but MPT can't. Whenever I launch MPT, my bluetooth manager (on my PC) says "Connection Failed". I know this is a fairly vague question, but are there any tricks in getting MPT to see my phone?
This doesn't answer your question but MPT 4.0 is in development right now and from what I hear they are working on improving the end user experience. Not much in the way of major new features, with the exception of supporting many new bluetooth stacks. The improvement will be in how the product works, from the GUI to updates to anything else you can think of. Hopefully eliminating questions like these.