if I use plugins for editing artists I can't determine how it works:
Use "All plug-ins":
no group members are downloaded
only biography, similar
Use Discogs-Plug-In only
biography, group members, similar
Use last.fm only:
biography and similar are downloaded
I don't noticed this before, so I filled all band members by copy and paste...
We are in the process of improving how plug-ins work and function.
The feature you mention where you can select "All plug-ins" or select a plug-in separately is currently a bit inconsequent. This is on our to-do list to improve very soon.