Testing version: Version 1.0 (362)
What were you doing: Enter zen mode -> Show toolbar
What feature did you use: Zen mode
What happened: I entered zen mode, then clicked “View > Show toolbar” from the menu bar. The result was the toolbar being shown without background color.
What did you expect to happen: The toolbar returning to its normal state. I’m not even sure if this will be in the final product, but I guess better be safe and share.