I just tried the uploader and it did not work on Firefox 11.0.
Firefox 11.0 with basic up loader worked.
Just tried IE 9 and it worked. Seoul Tower, South Korea
Just tried chrome and it failed.
Chrome (18.0.1025.162) worked with basic up laoder
Opera failed.
Just did an update on Opera to 11.62, then selected basic up loader and viola.
Safari failed also.
Safari with basic up loader worked.
All were tried on Win7.
So far I am leaning towards programming. There might be a cross browser compatibility issue in the code. Just a guess.
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My newest guess is that the code for the default up loader is broke. I just used all the browsers on win7 standard X64 with the basic up loader and they all worked. So that narrows the problem down quite a bit. Have who ever look at the default up loader and see if they can find a coding issue.