The board has been upgraded to phpBB 2.0.6.
I had a frustrating time doing this because the method of upgrade was a bit different than what the documentation, or any posting, mentioned. Or, perhaps, there was an assumption that was never made explicit.
Not only did the upgrade scripts have to be located in the main board directory but they also had to be located one level down along with all of the files from the main directory. (For some reason the upgrade script looked for certain files by going up a directory first - however, it also wanted certain files in the same directory as itself. Talk about schizophrenic.) I don't have any idea why this kind of duplication was necessary. Without it, I either got script errors with nothing happening, or the server simply crashed.
Upgraded to phpBB 2.0.6.
Moderator: jasonb