They can be very complicated to troubleshoot. Unfortunately, I was unable to find anyone that had written a troubleshooting guide for them. I haven't done troubleshooting for them in a few years, because they have gotten much better.
First, make sure that you have all the latest patches. If the problem continues, uninstall the existing FrontPage extensions using add/remove Windows components and then reinstall them. If that doesn't fix your problem, I would backup your IIS configuration and reinstall all of IIS.
Sorry I don't have a more elegant answer -- it is possible to troubleshoot the extensions without removing them, but digging through the FrontPage configuration settings would be impossible for me to document well. Hope it helps anyway.
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