No Page Display in Portal (UWL)

Hi all,
Currently, I have a user who normally can approve one employee leave request under a role. Now, although employee has submitted leave request via portal, the user (approver) couldn't load the page (where he/she normally approve the leave request via that page of portal) and thus stuck in the leave approval process.
There is no Java (J2EE) error but just a blank page with buttons (Menu, Back, Cancel, Tools) on my page.
I tried to log in as administrator and look at the Assigned Role utility (under User Administration) for that user, and seems the role is correctly assigned to the user. It should load the work item execution page but nothing is there without known error (not even java error being displayed).
Is there any other authorization involved that I may have miss out?
Also, I am not quite certain whether it relates to cache problems. But I can see there is a Cache Clearance at System Administration->System Configuration->Universal Worklist Administration->Universal Worklist - Cache Admin
There are two options:
- Clear Expired Items
- Clear Cache
What is the impact by choosing one of the above options?
Any advise is highly appreciated.
Thanks and regards,
Patrick

Hi Prathamesh,
Thanks for your information. However, does clearing Cache will help to prevent Blank Page (Just having Menu, Back, Cancel, and Tools button on the blank page) though user has created a leave request to manager to be approved?
Apparently, when I look into those other successful work items (Leave Approved), it has a webservice being fired at the Terminated Event tab. I am suspecting the webservice couldn't be fired ,and thus users having Blank Page when they tried to approve the leave request.
Do you have any idea why those webservice could not be triggered? Anything relating to Portal configuration or setup?
Appreciate your advice.
Thanks and regards,
Patrick

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