I had just installed aptbackup from cydia then all my downloaded apps suddenly got a white icon, so I restarted and bam they were all deleted. And now when I plug my phone into itunes it wont sync any of my apps.
Had the same problem, and when I plugged my phone into iTunes, found that all the apps had been unchecked in the "sync apps" tab. Rechecked all of them, and now iTunes is supposedly syncing them back. Waiting to see if it actually works....
I have a problem that may be related. I activated synchronisation for apps on a second machine, selecting to sync only the three apps that I had just asked to download. Synchronisation proceeded to delete all the other apps that had been on the iPhone prior to activating on the 2nd machine this morning. Is there any way to roll back so that I get that apps and the settings back? If not, can I at least get a comprehensive list of what to reload out of the machine? And what will happen when I go back and sync on my home machine?