Responsive yes/no selection has no effect on the demonstrated divs below

[kabexnuf]

Platform: x64 Windows 7
Browser: Firefox 19.02 Release & Google Chrome Version 25.0.1364.172 m

Steps:
1- Go to http://yui.github.com/gridbuilder/
2- When responsive grid is selected, resize the browser window and observe that columns collapse to the full width on lower screen widths
3- Switch to unresponsive grid
4- Repeat step 2

Expected:
Since unresponsive grid is selected, divs shouldn't collapse. Whatever the screen width is, number of columns should remain the same.

Observed:
Divs collapse just like responsive grids even though it is disabled. Parent div of the demonstrated visual divs,"div class="yui3-g-r" does not change. If I change its class manually, I can obtain the expected behaviour.

I see an exception in javascript console from rainbow-min.js

[tilomitra]

@kabexnuf That's quite odd. Could you paste the generated CSS output into this issue?