I've had this call for help on 4 Forums, and one gave me a link to the
Dreamfall Forum which led to a solution enabling me to continue the game !
All other suggestions unfortunately did not solve the problem... but I thank everybody who took time & energy to suggest solutions !!
It was mentioned (almost in passing on that link's thread) that reducing the antialiasing might help. I didn't believe that actually.
The game's video options include 5 degrees of Antialiasing, 4 degrees of Graphics Quality, and 3 degrees of Effects Quality.
Having a very powerful computer I had set all these 3 to maximum.
After the abovementioned hint, I set all 3 to minimum.
Lo & behold... everything goes as smooth as butter.
N.B. Not even
any of the suggested available 'preliminaries' are needed (e.g. listening to the notes first; getting the game hint to recommend finding a tune; whatever !!).
