I have encountered this error when using Flock on my factory.
======================== 00:55:05 ========================
server poll latency: 4.57 seconds
{'major': 1, 'javascript': , 'java': , 'width': 1024, 'flash': , 'request': 16682772, 'height': 768, 'bpp': 24, 'version': '1.1.2', 'command': , 'minor': 1, 'browser': 'Flock'}
Running flock "http://api.browsershots.org/redirect/ericwho-bsf/204a89e43ba1f6260cb7c3cdfb448b0d/16682772/" &
Sleeping 30 seconds while page is loading.
16682772-pgdn01.ppm 0 768 768 768
704 The bottom of the screen is blank.
Upon review of the screenshot taken, there is a rather large whitespace at the bottom and on the right side of the image. I'm not quite sure why this may occur, URL to an error image is... https://browsershots.org/png/original/6a/6ac11804e47108573cdbe1177d0e39bc.png