Okay, let me say this basically again: PPP and P5 expect a greyscale bumpmap for most file types. PPP and P5 expect a .BUM file to be a green BUM. P4 expects ANY file referenced as a bumpMap to be a green BUM. You can convert a greyscale bumpmap to a green BUM in P4 or with emboss filters on the R and G channels in photoshop (blacking ou the B channel). A .BUM is a 24-bit windows bitmap of a green BUM formatted map. P4 can reference a green BUM formatted JPEG, GIF, PNG, BMP, or whatever in the file. P4 will prompt to convert anything without a .BUM format. PPP and P5 can ONLY reference a BMP format file with a .BUM extension without converting it. Both of them do the same thing, except P4 prompts you and saves the results as a .BUM and makes the saved scene, figure, prop or hair reference the .BUM, while PPP and P5 don't prompt you and don't save the results an refer to the JPEG so it can convert internally later. A .BUM file that is pproperly green-red will work in all three. It's impossible to convert a green BUM to a greyscale standard bumpmap because the filtering is non-reversible. Except with paintstaking hand-recreation. However, you should contact CL tech support. It should not be crashing any which way.