Same here on x86 and when you tried to change user pic in control panel when UserTile is enabled you'll get a blank user picture.
Alpha 7. Added "Dynamic Userpicture" support, ability to set your own picture. Little slow and using WMP engine for now. Set your own picture - edit path in config.ini. Set system picture - delete config.ini.
How did you get the icon at the right side of the clock? And how come that the pic in the tile isn't my user picture? Looks good btw, what happens when ran on a real win8? Double userpicture in taksbar?
Latest version hangs taskbar when I want to close an app, and also doesn't work when I remove .wmv file from resources.