Problem with a midlet and GPRS - Please Help

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I run a midlet called Jupiter from www.alphatrade.com It is basically a financial data streaming program.

On my old Wizard it worked fine.

Now on my TyTn it ONLY works over UMTS (and works just fine). If I try to use GPRS i get this error:

Java.io.IOException:Invalid response from server: (-1)null

On my wizard this midlet worked over GPRS.

I have tried the original Intent Midlet manager as well as the updated one by Risidoro both with no luck.

Can anyone please help me with this?

Please please. This is a real bummer for me since I am in constant need of this service

Tech support is saying maybe the "IP stack" has a problem. Would this be part of the radio rom?

Any help is appreciated.