It appears that the plugin that we use for Avatars in School press is no longer working and no longer appears to be compatible. 

The alternative that is available, is to use the built in functionality of wordpress with Gravatar. 

When a user is logged into schoolpress and editing their own profile, under their profile picture, there is a link "You can change your profile picture on Gravatar" that will allow them to make a Gravatar account that word press will display the image from. This does mean that users will need to set up their own profile pictures as apposed to you being able to upload it for them.