How to Fix the Cydia Quarter Screen Bug after the Evasi0n Jailbreak
Users that have performed jailbreaks on both iPhone and iPad have red flagged an issue with Cydia following the Evasi0n hack. Cydia is now showing up tiny after rebooting. There are several tweaks that might affect Cydia’s functionality, but the main problem is that your device is running apps and software that aren’t compatible with iOS 6.
The list is quite significant, but the most often incompatible tweaks behind the Cydia quarter screen bug are the Deck, an old version of Transparency or an old version of RetinaPad. Although Winterboard and UIKit Tools are compatible with iOS 6 upgrading or installing these items might activate the Cydia bug.
However, the list of possible incompatible tweaks is quite long and goes beyond what you’d think off beforehand. Consult the entire list here. Some of the items in the list may not still apply since developers release updates of their software quite often.
If you’re looking for a temporary fix for the Cydia quarter screen bug, you can restore the app’s functionality by respringing. However, this is only temporary and the problem will not go away until you remove incompatible tweaks.
To fix the Cydia quarter screen bug, you have to manually uninstall any of the tweaks that might be incompatible with iOS 6. You will do that by first putting your iDevice into Safe Mode with SBSSettings (tap the Power button in its menu) or reboot while holding the volume up button.
To find out when your incompatible tweaks are scheduled for update, you can go to the package page in Cydia, select the “Change Package Settings” and then turn on the “Show All Changes” button, which will let you see upgrades to the package although it is not installed.