Solved it by...

"I did just the opposite of hideselect. I did ISOLATESELECTEDINVP and selected all.
Now it turned everything on and hid what was not selected. Since I selected ALL by entering ALL on the command line everything stayed on.
I view this as a trick of the program"

http://www.xtracad.com/forum/index.php/topic,9340.15.html?PHPSESSID=7itie690gu9fn39q2d9vf5ict1

I take No credit for the above - I found the solution on another Forum.

Thankfully it works a treat.