Any app. I installed cydia yesterday. Today I purchased and installed location spoofer. After installing it, my ipad rebooted. The lock screen looked weird, it was down in the bottom left corner. After entering my passcode, my home screen looked weird. The spacing was all wrong, apps were both in their folders and by themselves, it was weird. Trying to run any app, whether installed from the itunes store or cydia, causes a crash/reboot of the ipad. Even trying to open the settings causes a crash. Posting here as a last resort before just restoring the ipad, which will upgrade me to 4.3.5 and make the 2 bucks I spent on that program a complete waste of money.