I want to be able to easily link to other posts and pages within my site, not have to paste in the full URL. RB Internal Links is a plugin that allows this, by showing a list of pages and posts when you highlight a bit of text for linking. I installed it but do not see the option when I'm trying to make a link.

Does what you're trying to do work with the "default" theme?

I tried this with both Atahualpa and the Default theme, even disabled all other plugins, tried IE7, FF2 and FF3 but I could not get this plugin working. Tested the tinyMCE feature on WP 2.7

This does not seem to be caused by Atahualpa as far as I can tell. Perhaps a browser security setting, a web hosting setting, I don't know.

RB Internal Links plugin is working perfectly for me now, with Atahualpa. It's really great. I don't know how anybody manages without it, frankly. I don't know why it isn't a function built-in to Wordpress.

I think that earlier, I was just missing the icon in the editor. It's the one that looks like a page with a chain link over it. On my screen it's in the upper row on the right.