In my installation the "Auto rotate image" check box remains grey and can't be checked. I also tried a fresh install with the same result. I use PHP 5.2
Is there a trick that I couldn't find yet?
Thanks in advance.

The actual test is for the presence of a function named imagerotate in PHP. So maybe your php has this configured out. It is supposed to be available since 4.3.

Iti s not automatically availabe in PHP 4.3 or newer. According to www.php.net:
[i]Note: This function is only available if PHP is compiled with the bundled version of the GD library.[/i]
http://www.php.net/manual/en/function.imagerotate.php