[Oblivion Knight]

For anyone having issues with this plugin on vBadvanced CMPS:

The "fix" is relatively simple, $navbaravatar simply needs to be globalized and luckily vBadvanced comes included with a little tool that allows you to do exactly this! Go to the following location in your browser:
Admin CP -> vBa CMPS -> Default Settings

Scroll down the page slightly, and find the "Portal Output Global Variables" settings. Note that the description here states that the '$' before the variable name is NOT required, so simply enter navbaravatar there, hit "Save" and you should be good to go.

I hope this helps, and perhaps Sabe could link to this post for easy access to save any future questions about this..