I have two versions of a Drupal site running on my local dev environment. Site X boots perfectly; site Y doesn't - rather than running index.php, install.php is called.
So far, I've:
- Stepped through site Y with a PHP debugger; index.php does not seem to be called at all.
- Pointed site Y at the database for site X to see whether there were database corruption issues; seemingly, there weren't.
- Swapped out the .htaccess file in site Y for the .htaccess file in site X. No joy.
What should I try next?