Anybody else getting 504 gateway timeout all the time, when uploading with the web upload? I've had this problem for several days now, and it's the only way to upload vectors at Bigstock for some reason, so I can't upload anything at the moment...

I had the same problem saturday morning.
I have finally found that the culprit was Ghostery.
Once put BS on the white list of Ghostery all turned to work normally.