Official Mumble VoIP Forums

Looks like you are banned or something.

If you can contact the server admin ask them to check in the server log for the connection refuse/close reason form the servers side.
How do you connect to the server?
In the connect dialog does it show a server ping?
What is the error message when you try to connect?
About the lost settings I can only really point to the Windows registry. I don't know why they would become lost, unless the Windows user was changed, the registry reset/restored to an older state, or the settings in Mumble reset to defaults by the user.
Great to hear Mumble if of good use to you and your community, and you're still actively using and enjoying it. There are no plans currently. We have too many open tasks for how few we are anyway. :) That being said, I do think it would be an interesting feature. The user avatars were made square ba...
I'm not quite sure I understand. Are you using multiple Mumble clients? Or are you talking about the overlay of one Mumble client appearing in two Eve windows?

Are you running the same program (exe) for the multiple eve windows?
I’m not sure I understand your question. Mumble can be used entirely independent of games. So yes, of course you can use it on multiple platforms and connect to the same server to talk.
You’re welcome :)
You can use the whisper to shortcut to talk to only a specific user. In the Data column in the shortcut editor you can set the user as a target.

So this should work just fine with only one Windows client and two PTT whisper shortcuts set up.
Do you experience the issue at specific times, after specific actions? E.g. when just starting out using it? Being able to reproduce it would be most helpful. Checking the mic volume in Mumbles settings, and Windows audio input device settings would be helpful to see if it is a mic input volume issu...

What operating system are you using?