365 days of SL, day 98:
(Click for larger — 1920x1033 PNG, 1342 KiB)
No, I haven't started doing extreme calisthenics; this is just an example of another glitch that (very) occasionally pops up and that causes avatars to fold over at their hips.
It's known to the developers, but so far no progress has been made in tackling it, or even figuring out what causes it. It does seem to be a client-side issue; it affected every avatar around me last night, but I was the only one seeing it.
Some people say that there is a correlation with your computer's clock and SL's being out of sync; certainly enough, last night, mine was (they were more than 20 seconds apart), but you can also fix it by logging out and back in again, something that will not affect the clock differential. One of the Lindens also indicated that it may be due to some sort of memory corruption.
Still makes you wonder why after five years, they've not even so much as managed to track it down, eh? :) But at least it's rare, cosmetic (without other consequences), and easily worked around — which may be why they haven't invested more effort into tracking it down, of course.
Location: Sihasapa (174, 16, 22) (Pixies' Creative Learning Environment)