eNewsletter – Fatal error message

Hi,

I have latest wordpress and latest WPMU plugins’ updates.

Tried to create new newsletter and got following error for a few times (gave up after that):

Fatal error: Maximum execution depth reached (1000) in /wp-includes/cache.php on line 113

Fatal error: Maximum execution depth reached (1000) in Unknown on line 0

the same if I try to edit old newsletters.

Regards,

Norbert