OnMyComp.com

Since yesterday – a lot of people have problems with loading Cydia on their iPhone.
(People who do not know about Cydia; this is a little program to install other programs with – you can only use it on a iPhone which has a jailbreak)

Cydia is loading and then all of sudden it goes back to the springboard.

I have found a couple of solutions and they all go to “problems with the zodttd source”.
The easiest solution is – uninstall the zodttd via the Rock program. (Rock is the Cydia competitor)
Maybe you do not have Rock on your iPhone; then hopefully you still have Blackrain installed.
Open Blackrain – install Rock – and via Rock you can uninstall “zodttd source”.
After that – you will be able uninstall Rock (if you really do not want it) and you will be able to open Cydia.

An other way to make the zodttd files disappear; you need to get to the files of your iPhone.
This is something I have never done and I also didn’t do it this time = but I will give you the way to do it…
(but yeah – same as the Rock solution; all on your own risk !!)

Go to /var/lib/apt/lists/ and delete the three zodttd files.
Go to /private/etc/apt/sources.list.d and delete the zodttd list.

Both solutions I found via the forum of iphoneclub.nl