When i'm texturing, i use the tool 'From Window' allot of times.

But since a while when i want to do 'From Window', Blender just doens't do what it's suppost to do always (dunno how to say in English)

Does anyone knows what i'm doing/could be doing wrong?

I assume you are referring to the UV texturing tool. You can find a tutorial for it at this link:

http://www.ingiebee.com/tutorials/Blender%20tutorial%20UV%20Mapping.htm
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Haven't thought about that ...thanx