1.6.17 (SGS i9000) call blackscreen (no way to get it back up)

Apr 6, 2011
I recently upgraded to the 1.6.17 MIUI for my SGS i9000. It seems any time that the phone is used (calls both incoming/outgoing), the screen goes black (like the proximity sensor functions) but I am then unable to get the screen back. I am unable to end calls, and unable to use the phone without detaching the battery. Does anyone know where to look to fix this problem? Please let me know if you have ideas.