Created attachment 709314 [details] Press Gang Revision History Open a topic. Save it. Save window pops up. Make sure that your name is in the author field (it auto-fills). Enter your modification details. Check the revision tab after save done. Even though I made sure that my name was in the author field, the revision history shows the username as "Unknown".
This is expected behaviour when I asked Matt last week (or the week before), until Authentication is implemented. You'll note that your username is actually prefixed to the revision message, so that you can still tell who made the change. (Matt, if thats not the case anymore feel free to re-open the bug.)