I seem to have broken my save file. I'm at the point in the game where i've finished the cathedral level and have to go to morgan everett's compound, but when I talk to toby atanwe to go there the level doesn't load and I get this error: "Can't find ConCamera in file 'ConCamera DeusEx.ConCamera4". I did some googling but only found a site in russian. Does anybody have any experience with this or anything like it?
Also, FWIW i am running the game on mac OS X in crossovergames.

Definitely one reason to keep multiple save files!

At any rate, this should do as a workaround:

1: Activate cheats in-game by pressing 't', backspacing to delete "say" in the command line, and typing in "set deusex.jcdentonmale bcheatsenabled true" and pressing Enter.
2: Press 't' again, backspacing over "say" and typing the cheat "legend" and press Enter.
3: In the dialog box that comes up, click "Load Map", and on the map list, select "11_Paris_Everett". Make sure "Travel" is checked, and click the button to load the map.

Amusingly, this will make Toby Atanwe have that exact same conversation while you're already in Everett's place, but that didn't cause a problem when I tested this.

If this doesn't work, I'd say there's either something very disastrously wrong with your save that I don't know how to fix, or something unrelated to your save has gone wrong. If it doesn't work, let us know if you're using any mods, for instance.