Recently problem occurred where the navigation links seems to be missing

workaround:
my-career area appeared after removing setting in roles and workset; 


1.login as admin; goto 

Portal content
content provided y sap
end user content
employee self service
custom content
my career

workset mycareer ->  select properties -> goto leaf folder and click no;


2. .login as admin; goto 

Portal content
content provided y sap
end user content
employee self service
custom content
roles->  ESS -> click on the workset my career inside roles and select properties ->

goto leaf folder and click no


Conclusion make sure both are sync-ed
Last and not least if you want fast results
goto system administrator
-> navigation -> navigation cached and clear everything

Recently we got an error on the mss giving suer slow respond
and in MSS - Overview - workoverview [attandance overview]
it shows this error 


This problem is normally got to do with the
IGS - internet graphic service


please do refer to the link it will teach you step by step to fix or pin point the error.
http://help.sap.com/saphelp_nwce10/helpdata/en/45/f15ed044c741b2e10000000a11466f/content.htm


in r3 use the transaction code "sigs" to check on it.
you can even see the process in rz20..

Well if all this while there wasnt any error and suddenly it gave out this error. The quickest way is to reboot th whole SAP system.