I just started having this same problem today. Log in to the desktop app. get a message saying Java 6 needed to be updated...went to the site, updated it etc...now I get a black screen after I hit the log in. Does the same thing for the browser as well.
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type %appdata% in "run"
go into the bin folder
remove the version file (I deleted mine)
log in via the browser on Minecraft.net
Hope it works for ya'll :smile.gif:
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