I recently installed WP Smush Pro for image compression, and along with it WPMU DEV Dashboard. And since then I had noticed that I was unable to update any other plugins on my WordPress site. I knew they had updates available as Word Fence was showing errors with my site. And after some testing found that once WPMU DEV Dashboard was deactivated I was then again able to see any update any of the other plugins on my site.
I assume WPMU DEV Dashboard was not meant to do this, any idea why it would do this ?