Threaded sms msg Help?? plz

[genn28]

If I leave the txt msg setting on threaded. it wont actually send the msg. it will let me type it&push send then the top of the screen goes black& i have to do a soft reset. After I do that,a list of the ppl ive txted will show up in inbox but 2tap on a msg..it'll be blank. won't let me delete the conversation. hard reset does not erase it either...any way to just erase the msg database like on the centro?
oh only way i can txt is 2 turn off threading...