I'm also on XP (where the locking is more of a problem) and I spent a good amount of time going through all the texture references in the MAT files in my pose library and the hr2 and cr2 files that load textures. I went through them all in the Deep File Editor and corrected everything. (In some cases, where the set had many many pose MATs, I corrected one in the Deep File Editor and then in a text editor globally replaced the incorrect reference with the new, correct one. That saved a lot of time). The whole process was time consuming (over a month of nights to do...) but it had to be done. Now I don't get the locked error window and I do do as SamTherapy and check the texture references in the DFE right after installing anything new. THEN, Pbooost is a DREAM. And I've not encountered any bugs with 1.4 - though I also don't use the new things like thumbnail display...