I wanted to see how the "extra" visual effects looked, because I had never enabled them, and I decided I didn't care for them. After setting visual effects back to normal, some window title bars will disappear/reappear with mouse movement over/around them.
I just installed 8.10 tonight, and all I have done done the initial system-wide upgrade, and enable the restricted drivers for nvidia. This problem didn't happen until the switch of visual effects.
What should I do to fix this?