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Check to see if there are any updates available for your Mac
Use Disk Utility to check the integrity of the operating system
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Startup Disk (usually named "Macintosh HD"). Can check other drives as well.
Click Repair. Disk Utility checks and repairs the disk.
Try verifying the game cache;
Right-click on the game in your Steam library, select properties, select the local files tab, and click “Verify Integrity of game cache”.
Try reinstalling;
Click on “delete local game content” either in the tab or the right click menu.
If those don't resolve the issue I would go ahead and create and account and create a ticket at http://support.cyanworlds.com/ or you can also email at support@cyan.com
Same results with Myst V. My guess is these games do not work on 10.14.
Oh, and to the developer: Don't mark the previous post as answering the topic. It's not an answer but another user guessing as to possible solutions (which, as that user expected, don't work). We are awaiting your anwser.
On a 2012 iMac on 10.14.1(Beta) in testing we're not seeing this issue.
Same with Myst V on the same machine, macOS 10.14.1 (Beta).
As @Noitalever suggested, create an account and ticket at http://support.cyanworlds.com/ or you can also email at support@cyan.com for further help.
I have a Mac OS10.14
If you have not already, please create an account and ticket at http://support.cyanworlds.com/ or you can also email at support@cyan.com for help.
Did you try my suggestions? Is so I would probably try contacting Cyan support, I have not come across any additional ideas from other users yet of how to deal with such an issue on Mac OSX.
Hi, I've just recently purchased Myst IV for iMac 27" (late 2015), running Mojave 10.14.6 . I've configured my AV to ignore the Myst Iv.exe file, I've re-downloaded the game 4 times, and verified game files successfully each time. However, I get the same half a screen problem that you described here as soon as the game launches each time. And still no updates? If the game is unplayable, we should get a refund ... Really frustrating!
A few things you could try;
Check to see if there are any updates available for your Mac
Use Disk Utility to check the integrity of the operating system
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Startup Disk (usually named "Macintosh HD"). Can check other drives as well.
Click Repair. Disk Utility checks and repairs the disk.
Try verifying the game cache;
Right-click on the game in your Steam library, select properties, select the local files tab, and click “Verify Integrity of game cache”.
Try reinstalling;
Click on “delete local game content” either in the tab or the right click menu.
If those don't resolve the issue email support@cyan.com and attach your Mac's specs for reference.