Mac App Store Updates screen is blank
On my Macintosh under the menu, the App Store is showing that there is 1 update pending. When I click on it to open the App Store, the Updates screen is completely empty (all white) except for some copyright information at the bottom. Rebooting hasn't helped. The other screens (Featured, Top Charts, Categories, Purchased) all look normal. Any ideas?
MacBook Pro, macOS Sierra (10.12.6)