I did have a local Modules directory I was using for sub-compositions that I was working on at the same time.
But a quick play now and I wasn't able to replicate the problem ... except Vuo did just now crash.
I have been always on mains power for the dead battery option above isn't occuring for me.
A question about "Make image with Shadertoy" ... which may reveal my lack of knowledge on the subject.
Is the shader applied once to each pixel in the output image width and height, or (as I would expect) multisampling is being used?
If the later, then how does one adjust the degree of multisampling?