Game image freezes when I play it, but moves normally when I move the window

[Gaucelm]

Okay, this is a problem I have been having for a long time with AGS games.

So, whenever I play an AGS game, I always have the same problem: I hear the sound correctly, but the image on the screen is frozen.
When I click on the edge of the window to move it and maintain the mouse button, suddenly, the image is moving and loading correctly.

The game seems to work correctly when I click in the screen, except the screen stays frozen from when I last moved the window.

There was a similar topic: http://www.adventuregamestudio.co.uk/forums/index.php?topic=42252.msg560304 the author claimed that moving the window down on the computer's screen made it work better.
I tried it, and it did work better! However, it seems to work the best if I drag the window at the very bottom.

That feels... random. Why does it happen?
Is there a way to get rid of this problem for good? I wish I could play these games the way they are meant to be.

Thank you very much for your help.

[Crimson Wizard]

Does this happen with literally any AGS game? How many did you try? Maybe there's something in common with them.
What is your OS? What renderer do you choose to run the game: DirectDraw 5 or Direct3D 9?

[Gaucelm]

Well, I played at least five. This includes "5 days a stranger", some German-made "Maniac Mansion" fangames, the "Demo Quest" game and the playing system when I type "F5" to test my designed rooms.
Same problem every time.
It was only once or twice that I managed to get to run a game correctly, but I don't remember how I did it. And I think this was on an older computer (which had Windows Vista).

My current OS is Windows 7, Family Premium Edition. Version 6.1 (number 7600)

I don't know how I can choose my renderer to run the game. The winsetup doesn't offer this option.

[Crimson Wizard]

I don't know how I can choose my renderer to run the game. The winsetup doesn't offer this option.

Right, that's because these are old games which did not have this option. It might use DirectDraw then.
It is known that DirectDraw causes problems on Windows 7 sometimes. Did you try running any newer games? You could check just any random game from the games page made recently, here's Picks of The Months for example: http://www.adventuregamestudio.co.uk/site/games/picks/ (all are free to download)
It would be interesting to know if they will run with or without this problem if you choose "Direct3D 9" renderer in setup.

By the way, if you are making your own game in AGS 3 this option  will be available for you too. Just build the game with "Build" -> "Build EXE" then configure "Build" -> "Run game setup". The renderer option is a drop-down list in the top-left corner of setup window.

[Gaucelm]

Okay, I have been trying my hand into designing a game with AGS and it did offer me that DirectDraw option! Now it works correctly!

Thank you a lot!

[Gilbert]

This may also help you, and it is the first sticky topic of this forum.