You may need to double-check your SMSC (SMS Centre) number is correct for your carrier. I had the same issue on my Incredible 2 after flashing a non-GSM ROM, then flashing back to a stock-based, GSM-supported version.
To do this, find out the SMSC number for your carrier. Then dial *#*#4636#*#* and, at the menu, select 'Phone Info'. Scroll down until you see the 'SMSC' field, enter the number and hit 'update'.
Reboot your phone. This should be all that is required to fix your issue
Thanks for asking your question in the Q&A section. I know it can be frustrating because you're unable to post in the actual Development thread, but you asked your question in the right place, and for that I thank you
Let me know if you need something further!