iTouch WiFi

I have an iTouch. It will connect to the wifi and any app that came with the itouch that uses wifi (Safari, maps, etc) can access the internet with no problem. Whenever I use an app I downloaded, however, (like netflix, pandora, dragonvale, etc) attempt to connect for about a second and then give an error message that says it can't connect. Is it some kind of permissions problem/is there a way I can fix it? Thanks!

My first port of call would be to ook at the settings for those apps, to see if you need to specify the network.
It should have no problem normally though.

It looks like something in the operating system got corrupted. Restoring the ipod fixed it.