Just got my WordPress blog up with the modularity lite theme and got running on Godaddy last week, no problems, everything went great. I installed 2 plug ins, Nextgen gallery and sociable; made a post using both without a problem. I made a draft of another post for today and everything was fine until I posted it. When I posted it the main page of the site gave me the dreaded 500 internal server error. I change the post from posted back to a draft, and my site worked again. (Ability to access WP control panel has been fine throughout). Thinking I had done something wrong, I made a text only post, same problem. If I change it back to a draft everything works.
I also noticed that if I go straight to a permalinked item they display fine, even the "test" post that is killing the main page. I disabled both plugins with no effect so re-enabled them. I replaced the .htaccess with a default one, same thing.
http:polarbarephotography.com is the address that is showing the error and
http://polarbarephotography.com/2010/08/30/test-for-500-internal-server-error/ is a working permalinked page.
any help is greatly appreciated..