On some machines can not write nor reply email in mozilla when both the internet explorer of this error below.

Red Hat 5.4 64Bits
Zimbra 6.0.7 - (zcs-6.0.7_GA_2470.RHEL5_64)

Details of the errors of the Web page

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2;. NET CLR 2.0.50727;. NET CLR 3.5.30729;. NET CLR 3.0.30729; Media Center PC 6.0 ; FDM)
Stamp Date / Time: Wed, 11 Aug 2010 20:47:53 UTC

Message: Invalid character
Line: 1
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/

Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707

Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707

Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707


Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707

Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707

Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707

Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707

Message: 'ZmComposeController' is not defined
Line: 21 083
Char: 1
Code: 0
URI: http://xxxxx.xxx.br/zimbra/js/Startu...v=100610221707