Got it working!! 🙂
using:
<img src="' . $current_user->profilepicture . '" width="32" height="32" alt="" class="modified avatar" />
I can get the user avatar from any site in the network – even on sites were userpro is not installed.
I will try to improve this so it shows the male / female avatar if now custom avatar is uploaded.
Also I will try to write a a small plugin to override the standard get_avatar function on sites in the network, where userpro is not installed.
Thank you very much for your reply!! Would it be ok if I hit you on Gtalk tomorrow or thursday?
Will try to come up with some ideas concerning multisite 🙂 Hope I can help you.
Best wishes
simon88