Hi,
I think the possible reason could be the path for all the button files that you are using. It might be that you provided an absolute path for the location of those button images which are not found at the same location on the other computer.
To test if this is the case, create a directory on the distribution machine that has exactly the same path as the path on the development machine. If that works then it was clearly the case of incorrect directory. In addition you can try an
example program on your development and distribution machine to check if that solves the problem.
Also, you can try to re-install the correct version of CVI RTE if you think that could be possibility. It can be found at www.ni.com/downloads
I hope it helps,
Rajiv