Product:
Cognos Controller 10.4.2
Microsoft Windows 2012 R2
Issue:
Select menu – help – contents, gives a blank screen.
Solution:
Wait for IBM to update there www.ibm.com website, so the function will start working again.
Or browse to https://www.ibm.com/docs/en/cognos-controller in external web browser.
More Information:
https://www.ibm.com/support/pages/node/6454161