I created a fresh WordPress install (2.9.1) with the latest version of the Atahualpa theme (3.4.5). When I switch to the new theme I am getting a "Not Found" error displayed within the site frame (ie the header etc loads fine but the post is unable to load). Page displays properly when switching back to the default theme. No other widgets or themes are installed. I've successfully used an earlier version of Atahualpa/WordPress on another blog.

check your permalinks
what is the url?

I don't think permalinks are the issue, the site is using the default settings. The site isn't publicly available yet.

is it Atahualpa 3.4.5 or 3.4.5.1? there was a bug in 3.4.5 with 2.8 and earlier and thumbnails. I don't think this is your issue, but...

No, that was not my problem, but updating did not resolve it. It seems that the WordPress Themes site does not in fact have the very latest version.

I came across a related post which I somehow managed to miss before: http://forum.bytesforall.com/showthread.php?t=3406; suggesting that PHP needs to be upgraded to 5. This is not an option for me. Any suggestions?

Would you send me a PM with the URL?

Originally Posted by lintunen

I don't think permalinks are the issue, the site is using the default settings. The site isn't publicly available yet.

Please note as I previously mentioned, I was not using anything but the default settings! BTW I updated to the latest release 3.4.6 and the problem still exists.

What do you have set up at dashboard->settings->general for 'WordPress address (URL)' and 'Blog address (URL)'? (change the 'http://....'/ to 'http://mydomain.com'

have you got access to the error.log or access.log's on the server? Something must be showing up but without access to that info I'm at a loss.
Check the folder permission on the wordpress folder