Same...
1. 2013-12-04 10:39:56.126 /_ah/start 500 237ms 0kb instance=2
module=default version=bqdownloader
0.1.0.3 - - [04/Dec/2013:07:39:56 -0800] GET /_ah/start HTTP/1.1 500 0 - -
2.bqdownloader.referabuyer.appspot.com ms=238 cpu_ms=21 loading_request=1
exit_code=121 instance=2
Similar problems here
1. 2013-12-04 13:46:12.031
/SchoolConference/agxzfmR6aWVubmlrZWxyKgsSBlNjaG9vbBi5FwwLEhBTY2hvb2xDb25mZXJlbmNlGICAgIDI5IcKDA/
500 63143ms 0kb Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36