When I attempt to launch Hamachi, it sends me to Security Preferences, but instead of saying "System software from developer "LogMeIn, Inc." was blocked from loading.", it says "Some system software was blocked from loading." clicking on Allow does nothing. Suggestions?
Sorry for the troubles there. The only other time I've seen this reported in Mac environments was when there was a background application running that would block your attempt to click the 'Allow' button -- perhaps because of a security risk identified. I would suggest that you ensure you have no background apps running at all when trying to set up Hamachi next time.