This could be an issue of stickiness. Windchill likes to remember what page a user had visited last, and redirect the user to that page the next time they log in (which is referred to as stickiness). If that's the case, then clearing stickiness should resolve the issue. To clear stickiness, have the user enter the below URL directly in the address bar of the browser (Replacing <Server_Address> with the hostname of the Windchill server):
http://<Server_Address>/Windchill/netmarkets/jsp/components/stickiness.jsp
Then, click on 'Clear sticky info for all tabs'