I hope I'm writing this in the right place considering, structure wise, ipads, ipods and iphones are all the same thing. I've been having the same problem with my jailbreaked ipod touch for the passed week. I jailbreaked it with the most recent version of Absinthe and found that pkgbackup always opens slightly and then immediately closes. I went to upgrade it, but I'm always getting a "Size mismatch" error. I saw that a few of you said to be patient considering there is a lot of bandwidth being transferred back and forth, but the problem I'm having until the server works is getting the program to work. I uninstalled it, and reinstalled it, but it didn't help....do you have any suggestions? I uploaded a screen picture of the error I'm getting to make it easier to diagnose if it's different than what everyone else is getting.