(adsbygoogle = window.adsbygoogle || []).push({}); You can either disable the PreferenceLoader MobileSubstarte or install an older but stable PreferenceLoader version.

How to disable PreferenceLoader

Method 1 is to use on your iPhone the free Cydia > Search: iFile (it can also install deb files) and navigate to /Library/MobileSubstrate/DynamicLibraries/PreferenceLoader.dylib & edit the file's name by taping on the blue arrow button to open the File Attributes tab and rename PreferenceLoader.dylib to PreferenceLoader.disabled then on Done & after reboot the iPhone to apply the change:

[ATTACH=CONFIG]30700[/ATTACH]

Method 2 is to download the awesome free iTools (click on English) iPhone/iPod Touch/iPad manager on your computer, connect the iPhone and navigate to or cut & paste this in iTools' navigation bar: /Library/MobileSubstrate/DynamicLibraries/ and rename PreferenceLoader.dylib to PreferenceLoader.disabled, close iTools, disconnect the iPhone & reboot it to apply the changes:

[ATTACH=CONFIG]30701[/ATTACH]

Method 3: If your are a SBSettings user, you can simply disable PreferenceLoader: > SBSettings > More > Mobile Substrate Addons > and turn OFF PreferenceLoader.

[ATTACH=CONFIG]30702[/ATTACH]

Note: If your are a SBSettings user, you can simply disable PreferenceLoader without the need to replace it with a stable version: > SBSettings > More > Mobile Substrate Addons > and turn OFF PreferenceLoader. It's is not required to use PreferenceLoader really as it is only to show some MobileSubstrate in the Settings tab and it will not affect the SBSettings features and disabling it gives better battery life & a more fluid device. You can also disable Activator while you are there with the same benefits if you don't use it.

Install an older but stable PreferenceLoader Version Solution by tLustej.miCin

WARNING: Do not update Preference Loader via Cydia after doing this!

I experienced this problem too. Sometimes after installing some things the PreferenceLoader begins to crash. And here in the forums is a solution. Not sure where I know it from but I think there is another a bit easier way to fix this kind of issue.

All you need is:
Your iDevice connected to PC
Program to run on your computer (Windows or Macv): iFunBox or iTools (click on English)
Having downloaded a stable version of PreferenceLoader PreferenceLoader v2.1.1-1
Having downloaded iFile application (shareware - free) - Cydia BigBoss repo or Cydia > search: iFile

Then:
Use your program iFunBox/iTools and place the PreferenceLoader deb into the directory: /var/mobile/
Open iFile on your device and go to the folder var/mobile/ and there you will see your PreferenceLoader file
Click the file's name and hit Installer
Reboot your iDevice by turning it off and on
No further magic required. That's it!

Special Thanks to lostreaper for his Help!