Sorry for vague title, but I don't know how else to describe it, which is why I'm posting in the first place.
This is a lot to read, but I'd really like to know what's wrong, so I've provided a lot of detail (skip it if you don't need it, tell me if it's not enough).
5 days ago I was doing a tuck planche set, my usual 8 sec. When I relaxed, I felt some pain in my right shoulder, somewhere in the middle/rear delt area. I usually feel some unpleasantness/pain in that area when I release from planche; I just assumed this was because my shoulder girdle was not used to the my full body weight yet. But this pain was different in that when I tried planche again, it immediately came. I still had no pain during dips. During the warm up, I performed a bad forward roll (martial arts, not gymnastics) and hit the shoulder that's causing me pain, but I'm not sure that is what caused it.
2 days later I decided to skip the static holds, because planche was really bothering me and front lever was a little uncomfortable. I did a few things different than usual. I did Ido's shoulder routine, which was a little uncomfortable on the afflicted shoulder, and I did 3x5 dips (i usually do band assisted dips) and 3x5 pull ups (I usually can only do 3-4 per set), which, in hindsight was probably a bad idea. Later that day, I noticed the pain was spreading to other movements involving my delts. I thought maybe it had something to do with my rotator cuff.
So the symptoms since then have been: any lifting of my arm while loaded hurts, usually after the load of gone. Any support position hurts. The pain is like a tiny ache, then a big ache when the load is gone, and a heavier load hurts proportianately more than a smaller load. Pull ups hurt a little, nothing like planche, front lever is only moderately uncomfortable. Handstands don't hurt. The push up like position before a kick up to handstand does.
I don't know what the problem is, but I have an idea as to the general solution. Lay off all upper body work until I have no pain, then lay off another day or 2. I'm curious as whether I should do Ido's Shoulder routine with a really light band to stimulate the area.