My D2G just started doing this yesterday......I'll open either stock txt messaging program or handcent (did uninstall handcent for testing), I'll type in 3 or 4 characters of a txt message, the phone will freeze for a moment and then the txt messaging application will force close on it's own. Handcent would open a dialog box asking if I wanted to force close or wait. Choosing either didn't seem to make any difference the app still crashed.
I don't know if this is caused by some change I made to a setting somewhere, or if I shut off a process somewhere by mistake, or deleted a file by mistake.
My D2G is a stock unit with the .608 update....not rooted or anything else. It's driving me nutz.....I can't txt.