Hi JamesGoldsmith,
overkill650 has let me know about this thread, so I will see if I can help.
(Bear with me though, as I know that TS Mac is different from the versions I normally use)
From what I've read, the game is built on the TS12 game engine (with some changes), but uses the content base from TS2010. This means that as long as the content is for versions between Trainz Classics 1 and TS2009 SP4/TS2010, it should work. If it comes up Faulty though in the Mac content Manager, then it will need fixing. The way of doing this on a Mac is trickier than on a PC, due to the different application methods.
It may be worth, as others have suggested, trying the following:
1.Do a search in Content Manager for Open for Edit items. If there are any listed, these will need to be committed. This option is usually available by right-clicking.
2.On the Routes page, there is a gold star (if it has not been already turned off) at the top left of the page. If it is still showing as gold, click it to turn off the favourites feature.
3.In Content Manager, do a search for Faulty items. Any items that appear here will need to be modified, or you can see if there is any updates for it by right-clicking it and clicking Download.
Shane