[Plugin: WP-Members] Login showing up in sidebar?

If you don’t have a lot of content in place right away, the simplest solution might be to not block content by default (change this in the plugin’s settings). Then your sidebar content should display ok, but you’ll need to set a custom field block=true for the other content.

Of course, that will only work if each of these loops are handled separately. I’m not 100% sure they will be. But that’s where I would start.