Ramble doesn't woerk perfect to me. I always get those error messages when I first install ramble and try logging in. Ill sometimes get that problem now and then. What I'll do to correct it is turn wireless off then back on, or turn the bb off by taking the battery out.
I'm on tmobile though (8700g).
The main problem I have is ramble doesn't keep me signed on! It logs you out after a while when you are idle.