Here's a weird one ...
I've burned 4 or 5 DVD-R discs today using NeroLinux (22.214.171.124-2) - all are unreadable under MacOSX. The most you'll get is any subfolders and, if you're lucky, files without icons. When you click on any file, it disappears entirely and Finder updates with a decremented file count! Writer is Pioneer DVR-110D with latest firmware (well, as of Feb of this year). Kernel is 2.6.12-1.1381.FC3.R4smp.
At one point I saw that the driver was set as UDF (although I have no idea why or how it became ike that), and I deleted that setting and rewote using ISO9660 with no improvement. Have also tried disabling DVD Compatibility mode. Nothing seems to work but writing the same collection using WinNero works fine. Does anyone have any idea what might be happening here?