No, no, no--no problem with Aqua at all. Acrobat 5.0 was a Classic application, meaning its code hadn't had the ~10% rewrite necessary to run natively in both OS 9.x and OS X, meaning that its component files hadn't been given UNIX permissions. The owner of those files was "System," but since I couldn't remove them from the trash (except, as I later discovered) to their original location, I couldn't get to them because each username has its own Trash, and I couldn't find the one that had the files when I logged in as the superuser (this is a failing on my part).