Windows 10 - 19045.2965 / Groupy 2
With settings as listed:
Place tabs above / Show all (in the taskbar) / Always Visible / Traditional tabs / and Add background bar to the tabs
When a grouped window is minimized, and you hover over the app on the taskbar: clicking one of the windows in the group opens to that tab, but as you then click on other tabs in the group, the window switches, but the tab is not highlighted. The tab for the originally selected tab stays highlighted.
If you minimize again and then hover over the app on the task bar, hovering over one of the thumbnails causes the tab bar to be painted without the window. Once the thumbnail is clicked, the window then opens.
Grouped windows don't always respect the Groupy 2 settings.
The overall look of the grouped windows and the settings UI is very nice. Also, the flexibility of customizing the tabs is awesome!
Groupy 2 is not stable enough for using on my Windows 10, everyday driver, so I have gone back to using Groupy 1.5.
Looking forward to future beta versions.