Menu bar turns red on secondary screen

I recently updated to macOS High Sierra recently and noticed that sometimes there is a red bar/background over the right side of the menu bar, near time and Siri icons. This happens only on the secondary displays and also not on all workspaces.

It goes away if I make an app full screen and back to normal. I noticed this a few times on Sierra also but that was very rare and the bar used to be white instead of red. Is this a bug in Metal/Metal 2?

PS: The secondary display is connected via VGA.

I was experiencing this behavior on a secondary display as well. Although it is merely a workaround, I can confirm that putting an app in Full Screen mode on the secondary display will force the OS to redraw the menu bar.

First do a reboot and if that does not work try the following:

1. Reset NVRAM/PRAM. http://support.apple.com/kb/PH18761 (Should resolve the issue)

2. Reset SMC. Choose the method for “If the battery is non-removable”.

   https://support.apple.com/en-us/HT201295

3. Start up in Safe Mode. https://support.apple.com/kb/PH21875?locale=en_US

   Once in Safe Mode, click the “Restart” button at the bottom.

This also happens to me, and I've tried different displays connected via hdmi to hdmi, and i've also tried thunderport to hdmi.

A temporary solution that worked for me is just switching around the screen positions in settings > display > arrangement.

You can try that if the other answers don't work.