Montezuma 1.2.4 does not seem to be compatible with WordPress 4.0.1. I have re-installed both twice now and although the theme installs and home page displays, I cannot access the Montezuma Options. I get a 'connection reset' error. All other themes seem to work fine.

I'm in Windows 7 and WAMP.

I'm running that combination fine on several of my customers and locally on my own server.

Have you tried disabling ALL your plugins?
what version of WP did you upgrade from?
have you reset your permalinks?
Have you reset your home page (front page displays)?

Fresh install of WP 4.0.1 so no upgrade
No plugins
No change to permalinks
I changed the home page to a static page but then I changed it back to a posts page but neither made any difference. I stll can't access the Options page.

might be something to do with your WAMP setup, but I have no idea what.
did you try doing a google?

what if you try one of the older releases you can find here

Results of tests: version 1.2.3 - same effect. version 1.2.2 - same effect. version 1.2.1 - same effect, namely 'The connection was reset'.
Makes me think that some change in Wordpress 4.0.1 is causing this.

Went back to an older version of wordpress (3.9.1) as well as an older version of montezuma and I still get the same effect so maybe it is some wamp setting. However I'm reluctant to reinstall wamp just to try out a theme so maybe montezuma is not for me. I've never had a problem with any other theme including atahualpa.

I tried setting up a virtual domain which I did successfully but it made no difference to the issue here.

No plugins, no permalink reset, no home page reset, clean install not upgrade. I just activated the Montezuma theme and tried to open the Options.