I'm using Role manager to controll use access.
Posts marked as Private can be seen in the sidebar when you have logged in with the correct profile.
Pages marked as Private can NOT be seen in the sidebar no matter what profile you've loged in with!
I'm also using nextGEN gallery. And this has a similar problem. I use the nextGEN gallery widget to display thumbs on my sidebar. But users that havn't logged in should not be able to see the pictures in full size, by clicking the thumb. They are!
The site is http://www.amalie.thusgaard.eu
Please ask me any quistions that may help you help me.