Gepard Shield is attached to the server's IP address and ports, so when we did the recent migration we had to temporarily disable gepard shield because the new server has a different IP address assigned to it.
I'm not sure why you have a jdata.gpf as those are patch files, but the issue is not with jdata.grf. Gepard is attached to the client (jRO.exe), when we moved to the new server, we sent a client without Gepard shield over the patcher. If you see the Gepard splash screen when you run the jRO.exe then you never received that patch. Please send me a PM or message me on Discord and I'll help you out.