nisus.com

Still trying to get 2.5 to run. It starts, but as soon as I try to load a document or set preferences, I get the message that it unexpectedly quit.

Good thing I kept 2.1.3 - it still runs.

G4/400
OS X 10.2.8

You obviously didn't read the Release Notes file that came with your 2.5 download, you obviously didn't read the "system requirements" section of this page either.

NWX 2.5 requires OS X 10.3 (or later) dude...