Permissions Error on Calendar in OWA

[Scytheress]

I've been trying to access another persons calendar through OWA but as of about a month ago it stopped working. All permissions are properly set, and I can view other calendars, just not this particular one. The strange part is that I can access it to a specific date but weekly and monthly views return "You do not have sufficient permissions to complete this action."

I've tried resetting the permissions and using several different types of links to view the calendar but no luck. Anyone have a suggestion/solution?

Thanks.