Something similar happens to me with P6 SR1, but it's not after saving; it's after a render. After about an hour or so working in a scene--without adding or switching anything--P6 will begin to slow substantially. After that amount of time, I will have done several test renders. Then, all of a sudden, I do another test render, come back to the preview window, and almost everything is gone! Some of the scene props will still be there and maybe a hair prop, but everything else is gone. The characters are still listed in the drop-down but they are not there. Without saving, I check the file sizes of the pz3 and pmd. What used to be 7 or 8 meg files are now about a half meg in size. (I had done several saves before this happened.) Apparantly, P6 was saving the files while it was destroying them. NOTE: Each time the scenes were small. Two lightly injected mil characters and a few scene props. I've learned not to do anything larger in P6. It happened three times to me. I've had to completely re-do everything. I've never had this happen in P6 before SR1. Neither has it happened in P5, P4, or P4 with ProPack. I have a dual-pentium zeon, 1 gig o' ram, 350 gig HD machine.