AutoTrace

Hello, I have two computers. One of them is running with windows XP. The other, which is newer runs with Windows7. On both I try to use autotrace in conjunction with plot digitizer. It work fine on the older computer. I am pleased with the results. When I run it on the same test case within plot digitizer , on the most recent of my two computer, it starts working (a pop up windows shows up) and then stops with the following message : "java.io.IOException : no stream record; no path/curve datafound." Note that I have modified the PATH variable to include access to the folder into which I have unszipped the autotrace files. Plot Digititizer certainly "knows" that autotrace is present on the computer. I'd be grateful to learn what I should do to fix this bug. ubuflo