If you experienced problems with discussion comment permalinks not working properly in activity log or email notifications (they linked to invalid page), please open DiscussionsController.class.php in /activecollab/application/modules/system/discussions/models folder and change $comments_per_page value from 10 to 25.
PS: This is not a hack for changing number of comments per page, but an actual bug fix. This field will be removed from controller class and issue fully fixed in the next bug fix release.
PS: This is not a hack for changing number of comments per page, but an actual bug fix. This field will be removed from controller class and issue fully fixed in the next bug fix release.