It looks like the latest version of Chrome sandboxes itself and thus cannot be grouped as it does not allow Groupy to interact with it.
Complaints over this behaviour would have to go to Google as their app has chosen to act like this.
Neil, to be fair I don't know that just telling your customers to go to Google is going to be the best route for either side. I think it's reasonable to assume that most customers aren't going to report this issue in the forums and instead will assume that it's a bug in Groupy.
Seeing as Chrome is the most popular browser, that's potentially a good chunk of your user base who might see Groupy as being the problem, fair or not.
I would think that Stardock would have better success getting Google's attention anyway. A software developer might get a quicker response than a single user would.
This issue with Chrome also seems to affect Tiles as well: https://forums.stardock.com/497352/page/1/#3763075
Edit: Just saw sdRohan's post above. Thanks for the reply.