Hey I don't know if anyone else will find this useful, but this is probably the best place to post my find.
Okay, so sometimes I will use Sonar for a bit, close it, and go to run it again, only to find that any attempt at doing so will produce no effect. This only started happening after the X1 update. Oh and I have Windows 7 64 bit, which is relevant.
Well I experimented around and eventually opened up the task manager, and lo and behold, SONARPDR.exe was running the whole time for whatever reason. I ended the process and it all worked fine. No more restarting!
I don't know who needs this info, but I hope I helped someone out of a hole here.
Oh and nice thread, Freddie! So useful.