Corrupte image

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I know that in this example laks Setbuffer Backbuffer(). I was forgotten that to put in. But in the working code it is in. Your suggestion to use CopyRect was used to. Even on that i got the same problem. I have another copmuter by the hand and wil try to install Blitz3D on that computer. On that computer is stil the version directX 8.1 on it. If the code is working on that computer than i know that its not Blitz3D who give the problem but DirectX. I am suspecting that DirectX is the problem. Because you already say's that the code works on you computer.
I have two reasons why i suspecting DirectX.
1. A few mounths ago after installing a game my DirectX was corrupted. Game did not started and a lot of other games did not run anymore. All giving the same error. I did reinstall DirectX. And the only way to install it was in save mode.
2. I did updated another Basic (Dark Basic) And that basic needed a new type of DirectX. They delivered it also in the update. Is was Redist.exe version Directx 9.0c August 2006. All games working except Settlers 2 10th anniversary.
And now blitz3d.
I can't deinstall this version of directX. I did try it using differend programs. All say the same. This version is not supported.
So in a nut shell. I'am stuck whit what is got. I can not reinstall the computer because its a company computer.
So the wait is for the test on the other computer. And a wait for a new version of DirectX.

Al in one. Please stay giving me responce so that i can find a solution for this.