TYPO3 Core

Typo3 4.0 will throw an fatal php error during BE login when:
- a l10n xml file is faulty
- the language for the user is not english

Error message:
Fatal error: Cannot use string offset as an array in PATH\t3lib\class.t3lib_div.php on line 3596

Download the translation files for the language of your choice
Set the default language to the choosen language.

Reload the backend to check if the check wheater the translation works before we start producing bugs.

Edit a l10n XML file.
Remove all content so that the filesize becomes 0 Bytes or edit it in a way that renders the XML invalid.

Reload the backend -> Now you should whitness the fatal error.

If not: remove the cached translation files from /typo3temp/llxml/

Neither "Check status against repository" nor "Update from repository" within the Translation handeling section of the extension manager are able to detect the faulty xml file.

Reproduced with PHP 5.1.1 and 5.1.2 on Win32 and Unix
(issue imported from #M3480)