Activities screen hangs on "processing"

When I try to view activities from the member's screen, The screen comes up and then hangs on "processing." The following errors show up in my log:

php 12/27/2011 - 3:55pm Notice: Undefined index: sortBy in CRM_Activity_BAO... zeus
php 12/27/2011 - 3:53pm Notice: Undefined index: sortBy in CRM_Activity_BAO... zeus
php 12/27/2011 - 3:52pm Notice: Undefined index: sortBy in CRM_Activity_BAO... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: assignee_contact in CRM... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: assignee_contact in CRM... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: assignee_contact in CRM... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: target_contact in CRM_Utils... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: target_contact in CRM... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: recipients in CRM_Activity... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: target_contact in CRM... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: recipients in CRM_Activity... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: recipients in CRM_Activity... zeus
php 12/27/2011 - 3:45pm Notice: Undefined index: sortBy in CRM_Activity_BAO... zeus

This comes after using civicrm webform integration to create a contact form linked to activities. Thinking that it may have been the culprit i disabledthe module and wiped the activity table with no results.

On the other hand, in a search the activities show up fine.

I would appreciate any help someone could offer.