[willyjay]

Did you make some reg edit changes from the thread listed, or only install the arcsoft cab?

I'm on VZW, and all I do is (basic flash dance, but now task29) install MightyROM (or custom rom of choice), make sure I can send/receive calls (*228 is usually needed to program the phone), install imnut's arcsoft cab (soft reset). Verify that send/receive MMS works.

Not sure how many updates, cabs or personalization you do, but if I had issues, I would hard reset, flash stock, run task29, re-install MightyROM (maybe even redownload jic) and then set up MMS again.

Not really sure why it doesn't work for you.