We're having related problems - avis rez fine sometimes, then at other times one or both of us will have a pink torso, a dark-toned lower half, and feet that are exposed whether wearing shoes or boots with or without alpha coverage. Sometimes, clothing textures will creep down our arms or legs too. Downright weird!
We've tried all the fixes noted here and more. We turned off the computers altogether, unplugged them from their power sources, reset the modem and started up again. Have the latest graphics card drivers on new computers running Windows 7...been to protected water and done all the total clearing of cache and relogging while the camera is underwater for the Inventory load, etc. - have even done clean reinstalls of the viewer (LL V3). Nothing works. (And yes, this issue just began with the last update of LL V3 not with the new computers - which are now four months old.) Tried Firestorm - still have the issue. Completely eradicated Firestorm (didn't much care for it) and even deleted the LSL AO and Bridge folders that showed up in V3.
Last night, we were out dancing (yep - looking like this, LOL!), and all of a sudden (near the end of the concert) my avi was fine. But then we went home to logoff, and...you guessed it! - problem returned.
So...I give up! LOL. Just gonna wait it out and see if the next viewer update resolves this or not. If not (or if the problem gets worse), I'll be hollering! And loudly.