Unable to update WPMU Dashboard and Wiki plugins.

I have notifications that there are updates for the WPMU Dashboard and Wiki plugins, but when I attempt to update them, I get the following result:

"Downloading update from https://premium.wpmudev.org/wdp-un.php?action=download&key=7a176d2efdb292fbe2241a31dc9cfa9e287c8001&pid=119…

Unpacking the update…

Installing the latest version…

Removing the old version of the plugin…

Could not remove the old plugin.

Plugin update failed.

Return to Plugins page"

Additionally, I notice that if the DEV Dashboard isn't active, I don't have update notifications.

Running WP v3.4.2