Hi
I don't know what's happend but for an unknow reason index.php return an empty page. When I check with firebug the size is 0.
I don't have even an error or a message.
I don't have a strong skill for php but I put some trace in index.php and it's never continue after this line:
// init application and start session with requested task
$RCMAIL = rcmail::get_instance();
print "\n";
I hope it's will be help