[imp] problem with IMP 4.1 RC2

[Lucien GENTIS]

*Hi to all,

I have installed Horde 3.0.9 with IMP 4.1 RC2

When I connect after IMP authentication, and when
I want to open my message box, only menu and toolbar are displayed.

Instead of messages list, there's this error:

Notice*: Undefined index: audio in 
*/usr/local/apache-2.2.0/htdocs/horde-3.0.9/lib/Horde/Notification.php* 
on line *190*
*Fatal error*: Call to a member function notify() on a non-object in 
*/usr/local/apache-2.2.0/htdocs/horde-3.0.9/lib/Horde/Notification.php* 
on line *190

If I turn off "Display_error" in php.ini, message list frame is blank.

I've tried with horde 3.0.7, with PHP 5.0.5, with PHP 5.1.2, same problem.

This problem only occurs with IMP 4.1 RC2; all works fine with IMP 4.0.4

Thanks for help
*