I try to use Homeworld Emergence on CrossOver om my iMac v. 10.13.2. Its works fine with the intro (Sierra and barking Dog logos), but on launch of the game the screen turns red/black, while the sound still play, and the keys work. Any suggestions how to fix it?

A quick google pulls up this FAQ:

https://support.gog.com/hc/en-us/articles/115003913665-Black-screen-or-crash-on-launch-

I:m not in a position to test but you may want to give it a look see and see if changing the settings within Crossover will help.

Hope this helps