cl-netbox' icon on all sites id a blue square with the white letters
cl. It shows up this way in the user list on the right and even in the popup bubble opening when I click his name. However, some chat messages have him with a default Gravatar (those green random triangles) showing up as you can see in the screenshot above. Not all messages show up the default icon though, it probably depends on the displayed icon size.
I tried both Firefox and Chrome, with and without add-ons, logged in and logged out, all show the same behaviour. Strange thing is that initially only cl-netbox was displaying incorrectly on my Windows 10 work laptop, but now also Thomas Ward is displaying incorrectly on my home Ubuntu notebook.
Hard refreshing using Ctrl+F5 sometimes changed the appearance of the icon on the left to some of the messages, but not necessarily all of them, and not always to the correct direction. Later posted messages may still show up with either icon...
I know this bug is very strange and probably difficult to reproduce for someone else, so it might probably be necessary that you provide me instructions on how to investigate the problem locally further and provide important information.