I've been reading ALOT tonight about all this traffic stuff (here, eBay, TomTom forums, etc), and I did read something about cheap copies
out there of these LT usb models, and a bad side effect is causing the unit to run in PC mode.....is yours an actual TomTom model????
also, with my research, I believe we need to add any 8th version, or add a 4b to the 4th version, as this one listed below is very similar, but take note of the picture near the bottom of the auction, as this one is ACTUALLY 2 pieces, not 1, and I have come across many negative posts of buyers who got this version instead of the one shown in version 4 (one wire) !!!!
"New" TomTom XXL 530 540 550 TM 4UUC1 RDS TMC USB Traffic Charger Receiver Kit | eBay