Site Configuration returns blank page I have just updated the Internationalization and language_dropdown modules successfully after Drupal asked me to. Having done that, the site configuration when clicked every time, returns blank page. Sometimes when I click it twice, it returns a screen with a table of PHP errors of the the l10n update. This is frustrating. I know that this is regarding the update I made. But a bit of searching indicated that this is because l10n_update is still available in beta3 form.
I would start by troubleshooting the horrid White Screen of Death.  Once you find the culprit module/file/function/setting this should be much easier to fix.

You may also want to scope out the Language Dropdown bug list, the i10n_update bug list and the i18n bug list.

If you will post back with details regarding the WSoD I'll do my best to update my answer.