Upgrading to a new Service Pack or version of Time Matters can cause the display settings for records that appear on the sublists of Matters to change. The result can be that too many records appear on the tabs (sublists) of Matter Forms. Here is how to fix the setting.
TIME MATTERS BLOG
Time Matters has two settings that determine which related records appear on the tabs of the Contact Form and Matter Form. This tip explains how to set these options so that you won't see too many or too few Related Records on these tabs.