Yeah, try this first:
SBSettings > System Settings > Fix User Dir Permissions > Fix Me
But "fix me" didn't work for me. I had to SSH into phone, find app directory, rename icon, then rename it back. Weird, but it worked after resprings and reboots and fix me, all didn't work.
Seems to happen randomly to different apps. Still, the only issue I've had with this jailbreak...been awesome!