Workspace/interface turned white, it will not change back to grey in preferences interface panel.

None of these worked for me! I have the same problem. Please help

Hallelujah!!!! I finally got it to work!!!

Solution:  Ctrl + Shift + H................. boom!!! I mean it took forever.. but thank you who ever said that

FIXED!

Pressing preview with *whatever* did not end up working for me, so what I ended up doing was exporting as an ai file and opening it again! Worked for me I hope this helps!

I had the same issue and I found it!!

Go to View > Trim View and it should go back to normal

ctrl+shift+h = hide/unhide artboards

it works!! Thanks Guys!

thank you so much! 

I found that control clicking and choosing the usual color solved the issue.

A solution if none of those options work is tho check the resolution of your project if its has been changed to a larger width/height zoom out of your project to see the edges and see if that's the problem. If that's the issue you then go to file new find the resolution of the current project ur working on open new project then close and reopen ur previous file it will go back to normal

CMD + Shift + H or View > Hide Artboards

All that this feature does is hide all the artboards and makes the background white. It's a useless feature for 99% of people. Go to Edit > Keyboard shortcuts to disable this.