You could try switching to Xorg, perhaps this helps. At login click on your username, then a cog on the screen appears. There you set Zorin on XOrg.
You could take a look at this thread:
You could try switching to Xorg, perhaps this helps. At login click on your username, then a cog on the screen appears. There you set Zorin on XOrg.
You could take a look at this thread: