I have 3 levels besides visitor. free, member and artist.
When I am a free member and I view the subscriptions page, I see that I have the free subscription, and options to upgrade to artist or member, but no actually link to upgrade, just the text.
When I am a member and I view the subscriptions page, I see that I have a free subscription and member, but no mention that I can upgrade to artist, and vica versa if I have the artist subscription and not the member one.
If I have both member and artist subscriptions, I get a long mess of a page with all sorts of options that make no sense.
I have three images, one for each scenario. I can't see how to insert them here so here's links to them instead: