What I had to do was this. Flash the rom (after the usual wipe stuff) let the rom boot up and run for about 15 minutes, then dial *#*#4636#*#* and go into phone information, change the radio to GSM Only. wait for a few (usually about 15-20 seconds) then switch back to GSM/CDMA auto (PRL).. let it sit for a bit and you should get 3g/4g as I did.. I live in a 3g area this worked for me.
I did have a problem where it would drop connectivity after 20 minutes or so, what I did was went back into phone information via the number above and turned the radio off for about 10 minutes then turned it back on and it worked fine. (not sure if its this way for everyone and also if you have to restart your phone you may have to repeat these steps)
GL hope it works for you.
Regards
Biased
I flashed the latest release from today/tonight, but I was still having the no data issue. I remembered this post from earlier today, followed the steps exactly and now have 4G. dancedroiddancedroid thanks for the suggestion.