JCleaver... I've tried that.... Doesn't make any difference! In fact I've tried just about everything in the "advanced" and "security" sections of all the file and folder properties! It's a problem Ron has, and now I've converted to NTFS my problems are even worse than his so it's not just him! Ron has found a fairly obscure way of stopping the problem but it doesn't work for me. SCOTT..."Now I can edit and save virtually everything. Even if Poser is running and the item is loaded into the Poser scene." What did you do to allow this? Did you change some folder security settings? Ron's using Propack and I'm using P4.03 and my problems seem worse. Scott..."Could it be Poser's relationship to the old .rsr file structure?" Probably... 'Cos they're possibly opened in a different way by Poser than the PNG's... I'm opening a new thread on the POSER_TMP.rsr file which Poser keeps on creating in the POSE folder..... This is not going to delay (any more) the release of PBooost... but I have to add a rider to the app saying that NTFS drives may cause problems. Hrumph. Not what I would have liked. Any more suggestions? Ta! Howard:)