I just started using Groupy and I love it!
Instinctively for me, I was trying to drag one tab of a window to the tabs "area" of another group of windows, and Groupy would not add it to the group. Is this working as intended? -- so, grouping will occur in the title bar and the Windows tab regions, but not on the tabs that Groupy has created?

If I'm not missing something in the options, perhaps this could be a suggestion that might be considered in the future.
Relating to this issue, as I took a screenshot of the window with Snagit (10), one other minor setback for me seems to be that Snagit no longer views a window with Groupy running as an object to easily screenshot separately on its own. The tabs aren't recognized as the window as a whole... I'm sure it is an unintended occurrence of between two applications, but I thought I would mention it.
Thanks!