Dashboard Plugins DO NOT Install.

We have recently moved our hosting to a VPS system (Bluehost). After making this change, we are unable to install any WPMU DEV plugins via the Dashboard.

When we try to install we get an error that says "Install package not available". It doesn't matter which WPMU DEV plugin we try to install - the result is the same.

We are able to go directly to WPMU DEV and download the plugin then upload it as a ZIP and infall it manually. (SO while this is not a critical issue, it is a convenience issue.)

We're suspicious that our VPS may not have the necessary configuration in place to make this work - and - thus the error we are seeing and our inability to install any WPMU DEV plugins via the dashboard.

Any assistance/advise appreciated.