I suggest you download and install this:
http://forum.ppcgeeks.com/attachment...4&d=1252441764
That should give you the Update PRL and Update Profile icons in Settings. Soft Reset. Then from the Start Menu go to Settings and select the System tab. Then scroll down to Update Profile and click on it to run it.
Then do the same for Update PRL. If that does not work I am afraid you may have to flash back to the shipped sprint rom and Update Profile and PRL then if you still want to run MightyRom re-flash back to it. Obviously, flashing will require a hard reset.
Good Luck!!
FYI: Credit for that attachment goes to rileyd5
Don't forget to thank him!