you could type: killall mauku
in the xterm and tthat should stop any process involving that app. I used to have a similar problem with my email client. Someone here showed me what to do...so every now and then I'd have use tthat command. I don't what changed but I never have use it anymore. It doesn't do i anymore. It is a good command to know for any problem like this.
You could also turn off you wifi for a minute. Then turn it back on.