Despite all this problem, the idea of use text and css for show armies instead of big generate img is a good idea. Keep it.
it's greatly reduce load of server (bandwith AND cpu). But on the other hand, the multiplication of DOM element could kneel down low config and old client computer.
But Bruceswar was right. Maybe you could remove temporally the improvement (or make an option for user, like you did when you developed ajax for CC), and during this time, with a team of tester, who could feedback with many different OS+browser couple+config, you test and make a real good update, like we say in France : 'aux petits oignons'
