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You should probably email support@dribbble.com. Twitter isn't an "official" support channel, so your tweets are far less likely to get noticed.

In the interest of saving time: browser / version / OS? Any browser extensions installed?

Agreed, but as a follower I see how active they are and how often they respond to users.

For clarity: Mac and Windows Chrome sans extensions, but these days I'm running a few like Adblock and Chime.

I also have this problem intermittently - using Chrome v26, Mountain Lion.