@basj Thanks, but purging, restarting, reinstalling from new download, and restarting again doesn't change this strange behavior; it's still the same, groups one on top of one, but refuses to group one on top of two already grouped, unless first grouped with another stand alone app/window; then can be pulled off group of two and grouped with another group of two. Saved groups of three will load and group automatically together, but trying to add another to a group of two or three is refused -- starts to show the insert, but refuses to complete it.
I have settings to group instantly. I tried the delay setting, and that doesn't work.
This all started with 1.49 update.
Definitely need a fix to this bug, or will have to roll back to version before 1.49.