to the problem of skybox, most reason is the video card not good enough.
you can just resize the DDS from 4096*2048 to 2048*1024 with DX1 format.
here are some more skybox resource for those who want more changes......
Making Skybox http://bbs.mountblade.com.cn/viewthread.php?tid=36944
here are the download pack: http://pickup.mofile.com/1533652028716436
and some finished DDS for download: http://www.91files.com/?1R41JRG1JUCHKMCO31SO
the origenal address:
http://mpan3.homeip.net/earth
but if you want to use these in M&B , resize the pic to 2048*1024
Skybox Textures (4096x1024)
All textures are high quality JPEG, uncompressed TGA/BMP are not available at this time.
These royalty-free skydome textures work best when applied to a sphere or hemisphere.
Hint: To use them as skys in Blender, add an icosphere and texture map the image to it using UV map or 'Sphere' coordinates.
Hint: To use them as environment reflection maps in Blender, map it to an object using the 'ref' coordinates.
【the origenal page can not open again, so i had to use my picasa album: http://picasaweb.google.com/alixyang/SKYbox
you can download full size picture there, or just from the above mofile pack 】
clear day sky
cloudy day sky
broken day sky
overcast day sky
average day sky
foggy morning sky
cloudy moon night or stormy day
clear dusk sky
clear dusk sky thin atmosphere
sunset
sunset
sunset
stormy
dawn
dark night
【these high resolution sky boxes can be used for any non-commercial purposes with or without credit.】