Today, after a reboot, some windows are working with Groupy tabs, but others are not. In the attached screenshot, there are TWO windows grouped, but NO tabs. When I grouped these windows (same as I do every day), it never showed tabs. I didn't think it was going to group them because nothing showed, but they did group. Just no tabs! But you can see other windows (on the right) show the tabs.
Groupy was fantastic. Groupy2 is crap!

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