I’ve checked the maps you listed but sadly they show the same problem. The last 500 rows of pixels on the right side are streaked.
If I zoom in on a smaller part of the map then the problem is still there. The right side pixels are streaked, if I scroll the map to the right the image that is hidden by the streaks does show up and looks normal.
I’ve changed the backdrop of a battle with a 4000*2523 jpeg I had lying around, and the backdrop does show up. However the right side of the screen is still streaked.
I’ve also pulled this data from a file called drawdebug in the debug folder.
Initialising 3D Engine
Driver : nvd3dum.dll
Description : NVIDIA GeForce 8800 GTS Wrong graphics card detectedm, I actually have a GTX280
DeviceName : \.\DISPLAY1
About to Create 3D Device with width: 1024 and height : 768
Checking For Shader Support
hal_caps.PixelShaderVersion >= D3DPS_VERSION(2, 0)
Finished initialising 3D Engine
Initialising Render target of 512 X 512 rt_ship
Initialising Render target of 2048 X 1024 rt_offscreen1
Initialising Render target of 2048 X 1024 rt_offscreen2