I made a graphic: The doors where I did the yellow line have to be either both open or both closed. Because they can only changed with the dot marked by the yellow arrow.
As far as I can remember it sometimes happened that they were different (because the game sometimes closes doors if you landed), and it was impossible to get to Pad 3 or 2.

I tried with the version I found on the gamebase and could not reproduce the error yet. So I guess this is a bugfixed version.
Can someone confirm this?