zen button construction kit - cannot see the colors

Hi:
Initially I tried the version 1.6.8 and it did not work for me at all..
Then I went to version 1.6.7 and works a little bit more.
However, I cannot see the colors in the two preview buttons
preview.big and preview whenever I make a change.

Sometimes (i believe) i can create new color of buttons and see the list line of buttons with a color change.
But when I try to save it as a zip file buttons.zip I cannot open it and extract the files. I get the message "the compressed folder is invalid file or corrupted"

I can open many other zip files from other documents...I do not know why I cannot open it and everything working that bad.

Any suggestions? :lookaroun
Thanks
Marlake