I turned it off, sorry; it's back on now. My screen resolution is 1280x1024 or 1680x1050 - same on both monitors.
The 4.x is different, but yea, same thing - there's only a few px between the text and avatar - should be as much to the left and right of it. The username is bold and larger here though, unlike on my site.
I just uploaded 1.6.4 to our downloads area. Can you try that one and see how it works for the html in signature and custom fields?
The only file that was changed was dbtech/spotlight/core/class_fetchuser.php
If you want to just upload that one.
I'll look at the long username and long signature thing.