I was getting a little discouraged earlier today when I opened up WoW Model Viewer to find that it's buggy as hell. I figured I might get it to work if I just install an older version of WMV, and I was right with a slight catch. I have to downgrade WMV and World of Warcraft so that WMV works properly, per this article. I guess I needed to have two versions of WoW on my computer regardless of what OS I'm running, hah.
I'm installing TBC on the Windows partition atm and I'm only going to upgrade it to 2.4.3. So, I'll let you know how it works out if/when it's all done. Wish me luck!