What kind of hardware is it? 

We've had some issues with Coherent rendering with certain videocards on PC, but we turned on software rendering to work around that. This is the first we've seen of the issue on Mac.

Any information you could give us would be great. Thank you!

-Scott-

Can you attach your Player.log?

You can find it under your user's folder ~/Library/Logs/Unity/Player.log

The Library folder is hidden by default, so you may need to right-click in Finder and enable that folder visibility.

                                                                             Jason Winokur

This issue arose for me when I lowered the game's resolution when it was full-screened. The menu disappeared and wouldn't reappear (in full-screen) when the game was restarted and even reinstalled. However, after reading ZubaZ's comment above, I switched the game into windowed mode and the menu UI reappeared.

And anecdotally, OTC runs smoothly on low settings on a current-gen maxed-out MacBook Pro.

Please help me guys...The game is ruined for me. I have no menu so I can't play, I can't do anything...How did you manage to switch to windowed without having the settings menu? I tried CMD + Enter, but that didn't work.

For anyone else experiencing this issue on a Mac, you can visit the folder below to manually delete your options file and it will generate a new one upon the next launch:

/Users/mobile/Library/Application Support/unity.MohawkGames.Offworld

This issue has been compounded since the update:

You've now removed the options for particular screen sizes which means, at 1440 x 900 in windowed mode, the bottom of the game screen is pushed off the bottom of the screen, making the black market et al unusable. The only way around this is to flick back to full screen mode once you have navigated the menu screens into the actual game.

- NefariousTim