I'm sure the NOW and beta testers already noticed, so this tip is for L7 newbies like me.
When you add resources to the multiview panel, some demand use of the left and right arrow keys within their vertical column. But should you nudge it a pixel too far in either direction, disaster strikes. 'Everybody' closes (in the multiview) and you're left with a parallel resource of unknown vintage.
What's worse, when you try to reconstruct your multiview, it auto-checks the first 3 commentaries in the library (matching the accidental parallel resource, of course). For me, that would be NET notes, my African commentary, and something else. Oh, great.
I had to kill the whole layout and reload.
I would think in multiview, a L/R key would do a parallel for only the resource in the respective column. Not destroy the whole group.