I'm having problems changing my default journal (i.e. viewing any of the other journals - I have 5) in Firefox. Clicking on one of the other journal titles simply refreshes the screen but with the same journal - and that journal's Categories - still showing.
But using Internet Explorer is fine - it changes to the correct journal as expected.
Very odd - possibly something about the way that my version of Firefox is set up? Any thoughts would be welcomed.
Only thing I can think of is trying doing a shift-refresh after you switch journals to force it to load the current version of the page in case it's not automatically refreshing when you switch. No idea if that'll work or not, but that's the only thing I can think of. Generally DG works better with Firefox than with IE so I'm surprised you'd have issues with it and IE works fine, but you never know!
Have you restarted your browser or rebooted since you noticed this? That will often get rid of weird random bugs that pop up here and there. But if you've rebooted and it's still doing it then I guess it might be a FF issue. I just tried it in my version of Firefox and it works fine, but I'm on a Mac and I suspect you're on a PC so there's a good chance the bugs wouldn't be the same.