[imp] Cipher.php problems

[Jim Turpin]

I'm pretty sure I've got everything up and running, but when I try and login it says.....
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Warning: Undefined property: _iv in /var/www/html/mail/horde/lib/Cipher.php on line 89

Warning: Undefined property: _iv in /var/www/html/mail/horde/lib/Cipher.php on line 89

Warning: Undefined property: _iv in /var/www/html/mail/horde/lib/Cipher.php on line 107

Warning: Cannot add header information - headers already sent by (output started at /var/www/html/mail/horde/lib/Cipher.php:89) in /var/www/html/mail/horde/imp/redirect.php on line 84
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I've looked in cipher.php and couldn't see any problems....same with redirect.php.....any ideas?
thanks in advance
Jim