PUN Error In Latest Unity Beta (2017.1.0b3) - Hashtable ambiguous reference

PUN has been working fine for me until I upgraded to the latest beta version of Unity.

Now I get lots of errors similar to the following:
Assets/Photon Unity Networking/Plugins/PhotonNetwork/LoadbalancingPeer.cs(431,63): error CS0104: `Hashtable' is an ambiguous reference between `System.Collections.Hashtable' and `ExitGames.Client.Photon.Hashtable'

I know I can workaround this by modifying the Photon scripts to specify either to use System.Collections.Hashtable and ExitGames.Client.Photon.Hashtable, but just wanted to pass this information along regarding this problem with the latest unity beta.