All nodes in all shaders have gone missing, disappeared, invisible

I've seen an old post about a similar problem, so let me see if I can get you relevant info:

Unity 5.3.3p1

Windows 7 x64

SF 1.26

2 monitors

Suddenly, every shader opens up with the entire network missing. Cannot find any invisible nodes by clicking, can't find the network by dragging the viewport.

Shader code appears to be completely intact.

Tried re-importing both the SF assets and the shaders.

No reported errors in either Unity or SF console.

This has come at a horrible time for us- 2 days from GDC. Please help!