Suggestion: cycle through UI modes using F10. Hitting it once should set the backgrounds of all visible windows to black so you can see them. Then hit Alt-G to bring up your group window. Odds on part of it's laying on top of the chat tabs, preventing you from clicking on them (the click goes to the group window instead). If there's a window overlaying the chat tabs, move it out of the way.
To get back to normal, hit F10 twice more. It cycles through the 3 UI modes one at a time in sequence: black backgrounds -> no UI windows -> normal UI.
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