Maybe you are having conflicts with the program you installed trouble shoot by uninstalling (standalone) and reinstalling (plug-in) anyone could tell you this but it may be that simple or (standalone) may be buggy.
If you still have trouble or even if you don't give thus fix a shot :
http://forum.ppcgeeks.com/showthread...ht=Shadow+tech
Compatible with all carriers its impact will be noticed immeaditley