Uhh

[Conor12]

I get this sometimes too.
Spoiler!

Code:

var defaultSkin = (function(){
    var panesShown = {};
    var npanes = 0;
    return {
        show: function(id) {
            if(panesShown[id]) return;
            panesShown[id] = true;
            byond('rbutton_'+id).winset({'isVisible':true,'isChecked':true});
            ++npanes;
            byond('rside').winset({left:'rbuttons'});
            byond('rpane').winset({left:id});
        },
        hide: function(id) {
            if(!panesShown[id]) return;
            delete panesShown[id];
            var button = byond('rbutton_'+id);
            button.winset({'isVisible':false});
            if(''+button.winget('isChecked') ==' true') byond('rbutton_text').winset({isChecked:true});
            var rpane = byond('rpane');
            if(rpane.winget('left') == id) rpane.winset({left:''});
            if(!--npanes) byond('rside').winset({left:''});
        }
    };
})();

Also seems to pop up when I join #3 or #4 and forget to log in.