When I try to use the zipper/uploader sample code from your web site (http://browserplus.yahoo.com/developer/web/code/zipper/) I can select a file or folder, it tells me the original size, but then it tells me the zipped size is 0B - a savings of 100%. I re-installed BrowserPlus and tested with files in different folders thinking it was a permissions issue but no luck. This worked on my old XP machine.
I dug out my old XP machine that this worked on before and tested it,. It worked great. Then the next time I tried to run it the BrowserPlus pop-up window asked me if I wanted to upgrade to the latest version of BrowserZPlus and the zipper. I upgraded and now have the same problem with zip files being 0 bytes. It appears that the new version is broken.