Horde/PHP errors after upgrading

Production system, need help here....

We recently upgraded from 9.x to 10.8.1-RELEASE 113. When a user logs into :2096, selects Horde, and tries to check their Inbox, the following appears:

Code:

Notice: Undefined index: log in /usr/local/cpanel/base/horde/lib/Horde.php on line 49

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/cpanel/base/horde/lib/Horde.php:49) in /usr/local/cpanel/base/horde/imp/templates/common-header.inc on line 4

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/cpanel/base/horde/lib/Horde.php:49) in /usr/local/cpanel/base/horde/imp/templates/common-header.inc on line 5

I checked the cpanel bugs archive but see nothing relevant. Thoughts?

Thanks