[Plugin: W3 Total Cache] w3totalcache and mailpress not working together

Hi,

I’me using w3totalcache v0.9.2.4 and the last version of mailpress 5.2.1 and it seems to be somme problem. If I deactivate w3totalcache mailpress works perfect.
I’ve got a error log from mailpress with this message :

PHP [E_NOTICE] 8 : MemcachePool::delete(): Server 127.0.0.1 (tcp 11211, udp 0) failed with: CLIENT_ERROR bad command line format.  Usage: delete <key> [noreply]
 (0) in /home/www/wp-scoffoni/wp-content/plugins/w3-total-cache/lib/W3/Cache/Memcached.php at line 111

The subscription process to the newsletter is broken too, with an error when inserting data in mysql

2012-01-10 21:01:44 000000 -- MAILPRESS [NOTICE] - Connected (MP_Mail)
2012-01-10 21:01:44 000000 -- PHP [E_WARNING] 2 : mysql_real_escape_string(): 26 is not a valid MySQL-Link resource in /home/www/wp-scoffoni/wp-includes/wp-db.php at line 787
2012-01-10 21:01:44 000000 -- MAILPRESS [ERROR] - *** Database error, Mail not saved :
UPDATE <code>1845ap_mailpress_mails</code> SET <code>status</code> = '', <code>theme</code> = '', <code>themedir</code> = '', <code>template</code> = '', <code>fromemail</code> = '', <code>fromname</code> = '', <code>toemail</code> = '', <code>toname</code> = '', <code>charset</code> = '', <code>subject</code> = '', <code>html</code> = '', <code>plaintext</code> = '', <code>created</code> = '', <code>created_user_id</code> = 0, <code>sent</code> = '', <code>sent_user_id</code> = 0 WHERE <code>id</code> = 0
2012-01-10 21:01:44 000000 --  **** End   logging **** mp_mail *** level : 8191 **** status : FALSE

Any idea ?

http://wordpress.org/extend/plugins/w3-total-cache/