Re-import the same 3d model

Hi
I have a problem with working on 2 computers. When I imported the 3d model and set every material on first computer and then when I import the same 3d model but on second computer the D5 render import its like its was plain model with no materials. Clients made small changes and when Im re-importing the 3d model on second computer all materials are gone = all white. I checked later that when I re-imported this 3d model on computer that I was creating all materials are good.