1). I've seen the long zoning bug before, but the one I'm referring to is a default UI bug where the screen always gets stuck on "Loading UI resources". This one I've always fixed by restarting the game or even just camping to myself.
If it's happening ALL the time, that is strange, and I have not heard of this problem.
2). Make sure you have the latest version of java installed. You could try using this
direct link to grab the java file if needed.
3). I'll add a calendar button to the guild window.