I followed the steps on this page: https://drupal.org/node/195435 to style drupal's maintenance page.
All well until the moment I try installing another module (doesn't matter which one) via an url. It does not install the module and it just shows me my maintenance-page--offline.tpl file (-which should only be shown when the database is offline).
The problem also shows up when installing a new theme. I'm running the latest drupal version (7.23).
Anyone having the same problem? What could I be doing wrong here?