[x3d-public] How is a shader chosen in X_ITE? Looks like it works (at least at first, and then disappears?)

[John Carlson]

X_ITE has disappearing problems with

https://coderextreme.net/X3DJSONLD/src/main/html/bubbles.html

The included ../data/bubbles.x3d should be cross-platform--potentially 
any X3D browser, but only X3DOM and X_ITE are supported.  Please try 
yours and contribute fixes!

Problems: scene and geometry show up initially, then disappear, or don't 
appear at all. I will try removing X3DOM shaders to see what happens.

There's a small "flower" in the middle of the bubble in Chromium on 
Linux, which seems to indicated that a fragment shader got invoked which 
is returns white frag_color. If associated vertex shader doesn't load, I 
don't think the fragment shader shouldn't, IMO, but others can weigh 
in.  Others can report seeing this?

I will try to go over the shaders with a fine-tooth comb tomorrow.

I'll also run the XML file through validators!

John