Sorry, I know how much of a pain in the butt an "intermittent" bug can be...
It seems like, randomly, the tabs in the codeglass dialog fail to show up in Chrome on Mac OS X. The "A Simple Grid" example for http://docs.dojocampus.org/dojox/grid/DataGrid is one which fails while the previous and next examples seem to work fine. "Working with selections" example fails as well.