"Could not add reference to assembly ProtoGeometry"

About two weeks ago one or two of my custom nodes had the above error. I ended up being able to work around it and decided not to reinstall Dynamo at that point. Today I’ve had that same error (along with a similar one for RevitNodes) on a bunch of my nodes. Both .dll files exist in the directory but it doesn’t seem to matter. I uninstalled and reinstalled Dynamo 1.0 (stable) but still get the errors. It’s showing up on just about everything now and becoming a real pain.

Does anybody have any suggestions or know WHY this has become an issue recently?

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