Trend Micro CGI error; Your OfficeScan session has timed out

http://esupport.trendmicro.com/support/viewxml.do?ContentID=en-120531

Following instructions, I have changed

Security/permissions on the C:\Program Files\Trend Micro\OfficeScan\pccsrv\web\CGI folder
Security/permission on the C:\Program Files\Trend Micro\OfficeScan\pccsrv\Temp folder

Worked.