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Yeah, you should try it in a freshly created user on your Mac, so there isn't any question about whether you've got some odd setting in a preference somewhere. For that matter, you could grab a fresh SwissDisk account for the experiment.

Also, I'm a little puzzled by the "every 15 minutes" part -- does it keep asking even if you aren't actively changing things in OmniFocus? Are you sure it is OmniFocus that is asking you to authenticate? OmniFocus should only be accessing the server hourly if you aren't making changes, and you can see when it will next attempt a sync by looking at the Sync preferences.