Visual Studios Broken System Reference

I’ve searched for several hours now and I’ve not found much at all on the issue I seem to be having.

I just upgrade my unity to 2018.1.3.1f. Visual studios seems to freak out at my project. All the system references seem to have lost their path to the file. Monodev works just great.

Any idea what is going on with visual studios, it was working just fine before the upgrade on my system.

I have VS 15.7.3

Creating a new project does not trigger the issue, but the assembly references aren’t as many.
Thanks

Ended up doing this to resolve my issue:
https://answers.unity.com/questions/1439328/visual-studio-tools-for-unity-not-working-missing.html