Hi there!
I had the same problem and I thought that it was a bug
since there was no sulotion in the net.
Anyway I found a way to solve this problem:
Got to the Flowchart tab.
Select the disc icon by clicking once.(It’s the first icon in the flowchart before “first play”).
Go to the properties tab and at the bottom you will see the
“Operations” selection.
Click on the “Set” button and select “All Permitted”.
Now when you playback your DVD disc or folder with any player
the navigational slider will work.
Hope this help you.
Chris Gakis