Why do my iPhone apps keep closing

Everytime I go to open an app such as Twitter, Facebook, etc.It'll open, then there would be the blank page like when it's loading, and then they just close. My phone is a 3GS and it's jailbroken, but I've had it jailbroken for a really long time and it's never done this before. I've tried re-downloading the apps, but it's still doing it. And I tried turning my phone off for about 10 minutes then I turned it on and they're still doing it! Anything else I can try? I really don't want to restore because then I'll lose everything. But if that's my only choice then I guess I'll have to.

Reboot, Respring?