Icon for private chat and IP info only appear with Chrome on Windows.

In every chat post I get the IP address, "delete", and the small lock icon (to initiate a private chat) but only if I use Chrome on Windows. If I use any other Windows browser, or any browser at all on Ubuntu 12.04, then I do not see any of those info nor the lock icon. How can I restore them, and how can I open a private chat if the lock icon is not present?