I too am finding Eudora 6.2.4 crash-prone under MacOS X 10.5.1. I'm on a PB G4 17" Aluminum 1.0 GHz, 1.5 GB RAM, lots of free HD space. Symptom: Works fine (at normal speed) for a while, then user interface abruptly slows down to a crawl (example: selecting next message in a list, or dragging...