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This worked for me. I've outlined my steps on my Sprint Htc Touch (htc 6.1 rom):

1. in regedit entry KEY_CURRENT_USER\Software\Microsoft\Inbox\Settings \SMSNoSentMsg, change DWORD data existing Decimal value=1 to 0. Perhaps for some people, if existing value=0, then change to 1. Some forums indicated value from entry SMSAvailable. But I didn't see that entry in my registry. I saw only SMSNoSentMsg under the above path.

2. Go to Start menu \ Settings: Sounds & Notifications\Sounds, check both on Programs and Notifications

3. On tab Notifications: Event\Messaging\New text message, choose an event(s)

After all 3 steps, text message inbound should work. I changed the value in step 1 back to original value of 1. Sound still works. I think step 1 somehow "wakes up" the notification sound config