When I activate the image grouping menu by clicking on Images in 1D, the menu appears.
So far so good.
But when I click it again, then whole menu gets greyed out and won’t reactivate until I restart the project…
If you close the subpanel and re-select the images section, the subpanel re-opens with the buttons active.
I’ve never had it last more than one button press before needing a close/open cycle.
Hey Jennifer, thanks for the tip! Those Xes are just too small for me! 
Good workaround but I still think it’s a bug, if a tiny one…