I can't tell you how frustrating it is to spend hours texturing a major project, and to have all that work wiped out in a second. Then imagine spending hours repairing those textures, just to have that borked too.
This is what happens. Say somewhere along the line, you had to shift the texture of one prim, of a 200 prim object -0.250 in the vertical to get it to line up with an adjoining prims texture. Looks great, now move on down the line and texture some more prims, closing the edit window occasionally as you move along. Then all of a sudden as you close the edit window, every texture in the object shifts -0.250 in the vertical. Hours of work down the tubes.
I'm not sure if this has anything to do with the odd screen lockup I get at times when I close edit, requiring a ctrl-alt-delete to get out of SL. On relog I get the question: "SL has appeared to have crashed, do you wish to send a report?" which I do, they've gotten about 20 of them from me now.
If I'm doing something wrong, tell me please. This has never happend until this latest update. This needs fixing pronto. Very tough making tier in this manner, so as you can guess, Im highly PO'd.