My only guess'd be that you have Javascript run requests set to deny by default, but have whitelisted MtGox to run Javascript. Bitcoincharts doesn't use JS for charts, but GoxLive, BTCWisdom, and MtGox itself do. It could alternately be that MtGox has some type of code which reverts to a different language if JS support isn't detected.
Otherwise, maybe try a different browser. If you have plugins/extensions, might be worth a try switching them all off and refreshing to see if that helps.
Guess #2 - if you have a very slow Internet connection -- the way GoxLive draws charts, it first draws the axes, then takes a bit of time to download the data (~3 seconds on my slow 3G connection) to actually draw the graph lines and other information on the chart, so if you're just seeing the axes, that may be why.
I've tested javascript by going to this page
http://www.javatester.org/javascript.html, and everything seems to be working. And I never whitelisted MtGox...
And I can't even see the axes..