This is happening because there is an error being generated that is not being properly handled from within Tera-WURFL and it is getting through to PHP. Your server is configured to suppress all errors and so it shows nothing as a result.
There are two things you can change to be able to see the errors. Tera-WURFL attempts to do it for you but sometimes they need to be set in the Apache config or a .htaccess file:
display_errors on
error_reporting E_ALL & ~E_NOTICE
http://www.php.net/manual/en/errorfunc.configuration.php#ini.error-log
The most common causes of errors at this step are:
- 1. Your wurfl.xml file, data directory or log file is not writable
2. Your database connection information is incorrect
3. You do not have the correct Database modules (MySQLi or Microsoft SQL Server Driver for PHP)