This has been going on for awhile but it's been getting worse. A few thoughts.

1. I had mealies awhile ago. I DID take care of them, but I might be getting residual damage or something. It looks like the growing point on some of the branches are a bit messed up, and that's where the mealies WERE congregating. If that's the case, should I just cut them back and see if they put out new growing points or something?

2. I didn't have any normal pesticides so I used soybean oil, which works great with mealies on cacti and other non-leafy succulents and usually doesn't have any bad side effects, although I have had it do some odd things to the leaves on non-succulent plants (which generally wouldn't include echeveria).

3. Probably the most likely of the bunch, it's not getting enough light despite being RIGHT next to my window (which is huge, only a single pane of glass, and not really shaded by anything, but still...) However this still sort of strikes me as odd since I was under the impression that echeveria usually reacted to poor light by getting leggy and not massive shedding. Also the other whiteish echeveria that I never ID'd is doing fine, and it's getting slightly worse light.