Having a problem accessing Sesen puzzle 2. Step on the plate and the access puzzle symbol appears. Click on the symbol and just steps back off the platform. Try to go back on the platform, but have to use down arrow key instead of up arrow and still no joy in accessing puzzle. I have tried loading game from a previous point and going back through to the same point, but same problem. Cannot bypass puzzle either.

You should just be able to freely walk onto the platform then click puzzle icon and then solve the puzzle.
Though changing to puzzle screen goes without much special effect because it just uses the window

That's what has confused me. This is what I did with the previous puzzle without a problem. This second I just cannot access. I cannot go forwards or backwards. I have tried loading the game from a previous point only to get to the second puzzle with the same issue again. I have tried redownloading and reinstalling to no avail. Very frustrating.

https://www.youtube.com/watch?v=i_sGunWaht4