Poser doesn't read the text-based obj files in the geometry folders. It creates a binary rsr version of the obj, which supposedly can be loaded faster, and reads that instead. These geometry rsr files often become corrupted, causing various errors in Poser. Pro Pack, on the other hand, reads the obj files directly, and doesn't create binary versions, so it never suffers this corruption problem. 5) BUM files are uncompressed bitmap images that Poser uses as bump maps. Pro Pack can use BUMs as bump maps, but it can also use JPEGs, which are highly compressed and eat up less of your valuable hard drive space. In a way, reinstalling from scratch is an advantage (it's always helpful to clean house). But Pro Pack can't convert images to BUM format, so if you have any figures or props that specifically look for BUM maps when loaded, you'll either have to find a way to supply them, or edit the files to look for JPEGs instead.

Forum: Poser - OFFICIAL

Subject: Poser Pro, BUMS and rsrs