redsn0w 0.9.8b2 http://is.gd/6eek4Y should fix 50b3 App Store issue (if you’re already JB, just use this to boot tethered)
This was a tweet from MuscleNerd, member of the iPhone Dev Team
Redsn0w 0.9.8b2 was released to fix the sanbox issue that users was complaining about with Redsn0w .9.8b1. Redsn0w 0.9.8b2 has been released to recognizes the ipsws of all three iOS 5 betas. So when you follow our, just select the iOS 5 Beta 3 ipsw and boot tethered. No need to re-run the jailbreak if you have already jailbroken iOS 5 Beta 3 with Redsn0w 0.9.8b1.
But if you are doing a fresh jailbreak, You will have to install Cydia. And remember this jailbreak is tethered and will require you to connect the device to the computer each time it has to boot up.
Download Redsn0w 0.9.8b2 for Windows and Mac.