I decided to use inspect element on the working code in your demo.
When I clicked on the div it showed that jqx-grid-cell-right-align was in jqx.base.css on line 546, however, it was not in MY jqx.base.css at all.
I re-downloaded the widgets and re-copied the style sheets and it seems to work fine now.
Not sure how I got a bad version of the css but, oh well it is fine now.