Again me.
I've solved the problem. 😉
I just installed new version of V-ray: 1.49.01 ( I had 1.48... something)
And now I can import materials from the same vismat library I used to use.
Now I have: Windows 7 home (64bit), sketchup 8 pro and V-ray: 1.49.01) This set works fine.
Thanks for anwsers.