I seem to have a talent for discovering (or creating

) odd behavior in MODx.
I tried to upgrade to the new version of MaxiGallery (1.5.2) by copying the files to the assets/snippets/maxigallery folder and then pasting the new snippet code into the MaxiGallery snippet. All my photos disappeared so I re-installed MaxiGallery 1.5.1. Photos still gone - no manage photos button.
Then things got truly weird. In the MODx File Manager, many of my directories don’t show up. Even at the top level, two of my four directories are missing and many subdirectories simply don’t show. I don’t see anything systematic about which ones are missing and some of the missing dirs and files are above the level of the MaxiGallery directory.
All the files and directories are still there in Windows explorer and, except for the photos, everything in the site runs fine.
I tried clearing the cache, re-starting Apache, checking the hard drive for errors, and re-booting the machine with no effect.
Doesn’t MODx create the list in file manager on the fly from the physical directories? How can it not see directories that are there and have been all along?
Any clues appreciated.
Windows XP pro.
XAMPP 1.5.1
Php 5.1.1
MySQL 5.0.18
MODx 0.9.5
Bob