Installed on my Mac, tried to start it up, and got...
Conquests Game Data/Text/PediaIcons.txt:ICON_BLDG_Kitty_Hawk
"Not Found" or something like that. Something tells me MWNN(beta2.0).biq is looking for the Kitty Hawk in the wrong place.
Do I need to replace the original PediaIcons text with your modified one, or could you change where your scenario looks for ICON_BLDG_Kitty_Hawk?
(Other than "It aint how we do it on the Mac" I have no idea why they changed the way CivIII looks up stuff for the Mac version.)
Update: It's definitely the beta 2.0 scenario. the beta scenario had no trouble finding the Kitty Hawk, but then balked when it couldn't find the art/flics/Bush_anc.flic file. A file it couldn't find because there is no Bush_anc.flic file to be found. Or indeed any Bush_xxx.flic file where "xxx" stands for something or other.
The Mac is a cruel machine, for it is intolerant of errors.
Update Too: As a matter of fact, after trying a revised PediaIcon text provided by another poster I have learned that the Beta2 biq can't find another bldg icon. As a matter of fact, it would appear that Beta2 is looked for bldg icons found in the mod's PediaIcon file in the standard PediaIcon. Beta2 needs to be edited so it looks for mod specific icons in the right PediaIcon file.