The new version of the site which will appear very soon includes fixes for the following problems:
Mobile site scrolling incorrectly on some devices e.g. HTC Desire HD
Avatar resizing display glitch
Earlier this year several changes were made with the aim of solving the following problem:
Intermittent displays of wrong user name
Since then I have gone several weeks without getting any reports of the problem at all. If this continues I will consider the problem fixed.