Core hours worked well for me, until one office decided that their core hours would change due to high traffic. Suddenly an office that was only an hour earlier than mine was now leaving just after lunch. I had an office that was 11.5hrs off and we had a great setup where I would do night meetings one week and they would the other. The office an hour off of mine could never get their shit together to schedule meetings.

Core hours _should_ mean the core of the day, about 10 to 4, not whenever to whenever.

I agree. The worst part was one boss was in my office while the other was in the "one hour off" office. The local boss would get annoyed because I'd have to schedule something with the other boss who was already home when I'd get back from lunch. To "fix" the problem I moved my lunch back an hour but eventually that conflicted with local employees' lunch and meetings.

The way the place was run I was expecting one of them to suggest I just skip lunch.