WP-Signup showing up blank

My wp-signup is not working. For some reason it lets the first page where you pick the domain name work just fine, but the second page is coming back blank. It does create the new site, but the "Congragulations, [domain name] is yours. View it or log in..." bit is just blank. The rest of the theme seems to be there, but the content is not pulling.

Has anyone seen this or have any idea why this might be happening? We did just move to a new server, so perhaps there is some server setting that needs to be enabled... or something in the .htaccess file that needs to be tweaked. I also upgraded to the latest version before the move, but I think it was working on the old server...

Thanks for any leads.