My bad! I should have given those details.l.
I am using RoboHelp 10.0 . And yes, I did install the latest version of Mozilla, few days ago.
Yes, it is the same problem either with Chrome or Firefox. These are the browsers I have installed on my system.
Thanks a ton, Peter!
The official patch of RoboHelp 10.0.1 coupled with William's inputs worked.
A sigh of relief!