How to run apps in 3G ?

[lksdine]

Hi, I recently got my X10, it works fine. I have downloaded apps from market through wi-fi. But when ever i run the same app with 3G network. it is showing no connectivity. but i can see the 3g logo on the top. this happens in all the apps. i can only able to browse with the 3g. even am not able to open the market or youtube with out wifi. since am a new user am not able to xplore it.
Do any one have solution to this....