Hi Liam,
There could be quite a few things getting in the way. If my next comments don’t help, you may wish to submit a support request so that we can help you through the official channels.
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I’d recommend installing public beta #3. We have made a number of improvements to tracking backup. This won’t solve the issue of making each of your machines see each other, but it would likely improve the next step of actually synchronizing shows.
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Disable Wifi if it isn’t already and make sure that your LAN network adaptor is at the top of your network connections within the MacOS network settings.
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Go to Vista user preferences > network tab > press choose interface and reapply the IP address / network interface that you expect to be using > restart both applications.
Jack