I just done a test on the current compatibility of the latest viewer. I set HTML5 tp always for testing
Windows XP as we still have 15.8 XP users as Global stats it has to be supported.
Chrome v 34 works but sometimes weird loading of tiles, like fan
Firefox 29.01 tiles upside down
Explorer 8.0 just black page
Mac Snow Leopard
Safari works perfect
Chrome works perfect
Firefox 29.01 works but bad panning and moving hotspots which are mirrored upside down in "ceiling"
So back to HTML5:auto