I've changed my keyboard mappings so that:
"select minions" is tab, "select dg and minions" is caps lock, and "select dg" is 'Z'
Then I noticed a problem. While playing online/multi-player, those options are reset to the default / factory mappings - but the GUI still says the custom mappings are in place! In other words, just to the left of my spell slots are three bubbles that indicate "regroup," "select minions," and select all. The keyboard mappings you choose are shown on the bubbles. Those bubbles, in my game, do show "caps lock" and "tab," but those keys don't work!
To fix the problem I have to go to my control mappings and remap the keys, even though the mapping already claims to be correct. So even though the mapping already says "select minions" is tab, I have to change it again to 'tab' so that the mapping will actually "take" again. This is amazingly bad, because I don't notice the problem until I've already started an online game. During the game I don't have time to redo the mappings.
There may have been something that caused this. It may be because I upgraded to 1.20.0214. It also may be because another player profile was created - not another online account, just another local player. The profiles are changed through the day. Who knows.