Those recent render were done in 4.4 beta.
I am using 2 different glasses for my tests:
For one, I edited the mtl file (the polymesh has a normal, name: polymesh)
The other one is the one I renamed the object (in my 3d creation software) to "sweethome3d_window_pane"
When I modified the furniture texture to select the color of the glass in sh3d, that did work nicely in the 3d view, but when rendered in the best setting of the renderer, the glass that had the .mtl file edited was not colored the way I wanted and not as transparent, whereas the glass that had been renamed to "sweethome3d_window_pane" in my 3d creation software worked nicely as I had expected.
(I do not use image maps for simple color, I only use image maps for wood or marble texture and of course, I am not concerned about transparency with those)
The renderer, when in best or nearly best mode is what is giving me that behavior. So, I don't know if you have any control over that.
BTW, choosing a texture (such as the patterns) gives a cool, funky effect. I like that very much!
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coolglass.png
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(The one on the left (with the cool pattern) is the one named sweethome3d_window_pane.
The one on the right is the one that the transparency was edited from the .mtl file. I only have a peach color assigned to that one.)