I've used em before a good bit.
You connect it, synch via bluetooth and once that's done, anytime you launch the app it freezes and crashes? Or just when you try to tune it?
Might need to do a reset on the dongle itself, but I dont recall off top of my head how to do that, may be on the iTSX instructions linked below.
http://www.sctflash.com/PDF/iTSXUserManual_Rev2.pdf
Worse case scenario, just call SCT Tuesday when open at 407 774-2447 and they can walk you through it.