Darn it! After upgrading to Joomla 1.0.11, zOOm didn't allow me to upload images any longer. It just shows me an empty page, no matter what option I select to add images. That's certainly a security upgrade, but not necessarily the one I was after.
Independently, I went online and found out that there is a brand new version of zOOm available, 2.5.1 (I am still at 2.1.something), and I am deciding whether to upgrade. Follow me on my path to self-immolation on the altar of progress!