I don't have VB 3 installed anywhere, I need to redownload and install it. Hope to have time to do, I'm very busy with university!!!
Anyway, I have just seen that this version the plugin doesn't include the https gravatar option. So, if you run your VB3 on https then you should change in the xml before to install in this way:
Open the xml file, do a search&replace.
search for:
Code:
http://www.gravatar.com
replace with:
Code:
https://secure.gravatar.com
Well, I will just create another xml for those who need the https gravatar. I'll do right now