It's happened twice already. Tried to install Quick Gold from Cydia 3.0 it crashed springboard and hung. First time I had to force restart the iphone but when the phone came back, it got stuck in Safe Mode and I can not get out of it no matter how many times I restarted the phone. I can't find any info on how to get out of Safe Mode I had no choice but to restore again with the pwn'ed firmware. The second time I tried to install it, it crashed springboard again (did not hang) and when springboard came back, it's stuck in Safe Mode again. personally planning to stay away from Quick Gold for while until a stable update is released.