WindowFX momentum dragging does work with Groupy 1.1 release.
However, the Groupy windows still shrink when they move off the top of screen, for example when using 2 different monitor dimensions & WindowFX momentum dragging... or with just one monitor tools like the following to move windows relative to the visible screen area:
AltDrag: https://stefansundin.github.io/altdrag/
or GiMeSpace Desktop Extender CTRL-ALT desktop scrolling: http://www.gimespace.com/products/desktop-extender-3d.html
In most cases that is....Groupy windows do not shrink when title bar is above top of the screen if active tab is a process like notepad, vysor, process explorer, etc...which hopefully suggests that eventually all applications can be the active tab and not have the shrinking issue.
To make it easier for the dev team to see what is going on in Groupy 1.1, I have put a screen video (could only record the 2560x1440 screen of a multiple screen environment) & relevant screenshots of the entire 4 monitor screen area, including one marked up screenshot that shows the monitor dimensions & off screen area, in the album at the following link:
https://photos.app.goo.gl/9zDUB1Rxt5anDs5Y2
Please keep me up to date & I can provide any further info the Dev team finds useful.
Kind regards, Chadwick
View Ticket: #AEU-657-89523
re: "Posted on: 08 March 2018 10:53 AM 
Chadwick, Thank you for your report but I really want to get them into the Groupy forum as well - please post it here: https://forums.stardock.com/forum/1170
-Sean Drohan
Support Manager