Igot that too. Had to do a battery pull. I went into profiles and instead of showing none under alert I used "led flashing". No problems since changing it.
Posted from my CrackBerry at wapforums.crackberry.com
i dont know what you mean by "going into profiles"
theres a button that says "edit profiles" but it just brings up the menu in which i can choose to change from vibrate to silent and stuff
You probably just need to do a battery pull on your phone.
For how to modify profiles and answers to other basic Blackberry questions, check the 101 lectures - they are great. I have a link to them in my signature. You can also find the same link in the "Blackberry Help" menu option at the top of every page here at Crackberry.