Quite a few users are reporting problems with their YouTube application after jailbreaking their devices through the third release candidate of Blackra1n. Well, here is a tutorial explaining how to fix the error.
GeoHot himself does not know why the problems is there or how to solve it (apparently) but likely someone does. This guide is courtosy of halabibk.
How to Fix Blackra1n and YouTube app problems:
Download PushFix (213)
Install it:
dpkg -i PushFix.deb
- Reboot iPhone.
- After reboot the total loss of Wifi!!
- Do not panic.
Go Setting – General-Reset – RESET the Network Settings.
and
Source: xsellize