I had been using an older version of Atahualpa and had done a quick edit in the main page HTML to remove single page titles from showing so I could just put my own stuff in there without having to restyle.

Is there an easy way to disable these with the options page?

http://tampamason.com/?page_id=44

You can see whats going on in this page for example.

go to ATO-> Configure SEO
set 'Use Bytes For All SEO options?' to 'yes'
set 'Meta Title Tag format' to 'Page title'

Since I have the All in One SEO plugin active, will turning "Use All Bytes" to Yes in order to set the meta tag title format interfere with it negatively?

EDIT: Seems like it won't work at all since I do have the SEO plug-in active.

have you tried changing the 'Post Title Format' and 'Page Title Format' settings at WP Dashboard->Settings->All in One SEO?

Just tried blanking out both of those options in the SEO pack, no dice.

Even if I disable the plugin the original solution doesn't seem to work.

while using the 'SEO all in one' did you set the 'Use Bytes For All SEO options?' back to 'No'?
I installed the plugin and the suggestion I gave ou worked for me (we are talking about the page title that shows at the top of the browser windor right?)