Although included in the 800w also, I have had to do registry tweaks to get it to work. If you have done these tweaks with the STP then it you would think it would work. Try these steps after doing the registry tweaks....
1. Start your data connection (either with PIE or another program that requires a connection) and then close that program (not required but saves memory),
2. Start ICS and click on connect (Either bluetooth or USB but make sure you are NOT physically connected yet),
3. Now connect your PC or laptop to the phone (bluetooth or connect the USB cable).
This is how I need to connect my 800w, maybe the same for the STP