Can someone please help me...

i cannot change the preferences for contacts or messaging....this has only happened after 1.4 install....i installed 1.4 quite a while ago..and since then i thought i havent had any problems, but today when i decided to change my preferences for both i could select anything.....

should i do i full erase or doctor the phone?...i have no idea.... i dont want to keep on erasing the phone and installing things time and time again....

please can someone advice...thanks