Saurik announced today that Corona untether jailbreak for iOS 5.0.1 has been updated to version 1.0-5 in Cydia. This update fixes issues with iBooks and launchd that users were experiencing after jailbreaking their device with this tool, this was added in update 1.0-4.
Corona (5.0.1 untether) 1.0-4 is now out: users of redsn0w or the older packages should install. This fixes both iBooks and launchd (again).
— Jay Freeman (saurik) (@saurik) January 16, 2012
Later on Saurik also announced the update 1.0.5 which will force you to reboot the device when you install updates. This shouldn’t affect you because it’s an untethered jailbreak.
Corona (5.0.1 untether) 1.0-4 is now out: users of redsn0w or the older packages should install. This fixes both iBooks and launchd (again).
— Jay Freeman (saurik) (@saurik) January 16, 2012
If you have an older version of the untethered jailbreak installed via redSn0w or Cydia, it is recommended for you to install this updates so it fixes those issues.