Updating is suddenly broken on multiple sites for multiple plugins.

Updating is suddenly broken on multiple sites for multiple plugins of mine. Not sure why, but with even with Dashboard 4.4, any new updates for WPMUDEV plugins always say that the plugin is updated to latest version within WPMUDEV, but never are. Dunno why updates mysteriously stopped working or when, except it stopped sometime in January; maybe it has something to do with the newest version of WP that came out last month?

Highly descriptive error shows when updating from plugin page:

All other non-wpmudev plugins update perfectly fine. So wpmudev plugins must have a different way of updating (unfortunately?).

How can we fix this?

Thanks!