- download sbsettings from cydia if you haven't already (note: if you can't get cydia to appear in a normal window, try rebooting until it does). reboot/respring if necessary
- swipe from left-to-right or right-to-left across the top of the screen to get the sbsettings menu to drop-down.
- click the power button
- click 'safe mode'
- when you reboot in safe mode, open an app. it will either immediately open in a normal sized screen or appear shrunken again and then restore to normal size.
- click 'exit safe mode' at the top of the screen
- click to restart to return to normal mode and the problem should be fixed
you're welcome, alyssa