As I detailed in an earlier posting, Lego's WeDo software has had compatibility issues with new versions of Flash (Windows and Mac) and Mac OS X. Lego Education's WeDo download page offers a number of patches. I had to do a complete uninstall of the original WeDo package, but the new patches appear to work. For the Mac, there is now a python script run from Terminal which properly installs the WeDo software. For both Mac and Windows, there is a Flash patch that allows for the running of the WeDo's Activity Pack software. Please, if anyone has further difficulty with the software, drop me a line.