I just bought a Dell xps developer edition (Ubuntu 16.04). And the hardware is amazing, but Dell appears to have done some stuff to Ubuntu that makes no sense to me.
When I press ctrl+alt+up, down, left, right
By default it moves the current windows I have open around. Every so often, it changes workspaces, but pretty rarely. I don't care anything about having the grid, assuming this is what's breaking the workspaces. I use workspaces regularly.
I downloaded ccsm, but I can't find anything that's bound to the keybindings I specified. Also, unchecking the grid functionality didn't help.
I was able to find [this thread](ubuntuforums.org/showthread.php, that confirms the grid answer, and when I unbind the keys instead of removing grid all together the window movement no longer happens, but the workplace changes don't happen still.