I use a Mac PC with 10.5 Leopard OS. Most of the time when I try to use TomTom Home App. it crashes. It happen when I am using "operate my device". Most of the time it crashes when I do some entry items. Would it do any good to trash the current TomTom Home App and download it again. This is my first TomTom (540S) and I am really impressed except for the TomTom App. Thanks for any help. I am running version 2.7.6.920 app.