We're running Web Gateway 220.127.116.11.0 in our setup. All devices (bar a few test machines) have to go through the proxy for any internet access. One of our lecturing staff has recently reported a problem with https://bitbucket.org and when I investigated I found that the site was fine through FireFox and Chrome it was just via IE that it wasnt displaying properly. To me it looks like the stylesheet is being modified by the Web Gateway as when I test on a PC, using IE, with direct internet connection the site displays fine.
Anyone got any ideas?