At boot everything was marked - namely...

It is you mark , and the program didn't recognize.

Specially made this picture, I have the Seagull is clearly defined, and there I highlighted in red, the place where the program is determined not tea , and close the circle. In the program it is necessary to watch where the red spot in the square is highlighted.

some differences not captured

here I have a feeling it will have to explain to every new add
can the download page https://en.grandgames.net/differences/add
has anyone experienced warned about possible errors and what to pay attention when loading the puzzle?

Well, I'll try to make the picture that several times corrected and show what the problem is .

olenenok: vverh: