Shader Forge Node Viewport Empty

When I Load a Shader in Shader Forge, the nodes are absent/invisible(see image).

New Shaders behave as expected.
But I can not modify my excisting complex shaders.
Properties are still present and working.

I can still use the Shaders.

I’m using Unity 5.3.4f1 with Shader Forge 1.26.

This just happened to me. I’ve since updated to 1.27 but the problem persists.

Happens with new shaders as well as existing; only work around is to use the Return to Menu button and load a shader from there.

Unity 5.3.5f1

EDIT: Just realised this thread isn’t in the best of places. Will find the SF support area.

This is an old thread, but I came here because I had the same problem…!
(I reinstalled Unity, ShaderForge and cleaned up my project files… but it didn’t work…)

I solved this by resetting all preferences in Unity and… it worked! (Edit->Clear All PlayerPref)
(These settings were not cleared when deleting Unity???)

I hope this helps someone with same trouble. :)/