Seoul browsers' filmstrip fail

i ran several tests with video=true options
but all the screenshots are just black screens.

tests are

http://www.webpagetest.org/video/compare.php?tests=141022_R0_f2aaca6f27a01070b60709580a4fa7c5
http://www.webpagetest.org/video/compare.php?tests=141022_YG_5889980bf9d0c1e2a9fc157fbb45d19e
http://www.webpagetest.org/video/compare.php?tests=141022_GZ_0d67c5b23258589e9f0fab83502c3ba0

browsers tested are Chrome, Canary, Firefox
and url is http://m.photoviewer.naver.com/weather?listUrl=http%3A%2F%2Fm.weather.naver.com%2Fm%2Fmain.nhn%3FregionCode%3D08350105&imgId=278

Sorry, looks like Naver had logged-in and caused the desktop to lock and the agent wasn’t set up to automatically log-in on reboot. I just fixed it and you should get actual screen shots and filmstrips now: http://www.webpagetest.org/result/141023_52_15a475538e852a0cf6ac23172b2b61d7/