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Starting just about a week ago, every time I try to sync my iPhone or iPad, I get the message "Unable to synchronize database with server. The certificate for this server is invalid." My only choices are Retry or Cancel. I hit Retry, it takes me back to my iPhone or iPad OF environment, and sync will now work. But the next day, when I start up OF on both platforms again, the same problem is back. I am going nuts over this. I've added OmniFocus to the firewall settings on the Mac, I have the latest versions of all OSs and OF, and I have no idea why I'm having this problem.

Can anyone offer any help? I've already tried removing Bonjour (turning sync OFF completely) and reconfiguring it, but that did NOT help.