Well, textile workshops are completely busted now and the game has problems keeping track of what's cooking... Too bad I crashed my game through some boneheaded building decisions, as I was particularly curious how the game speed looks at massive amounts of colonists (get above thirty, and you'll start seeing they move in ticks. Get to ninety, at least in rev 39 stable, and the game promptly crashes).
Experimental builds are, by their very nature, experimental. There are definitely still some crash bugs - both in saves, and elsewhere - with Revision 39B; there are also some rather nasty glitches with the workshops. I'm working through what I can now.