I occasionally give a presentation called "That's not what I meant!" which is subtitled "Usually the drafter's precision carries the day, but sometimes the litigator's creativity trumps it." Our legal system generates seemingly endless material for this presentation and last week the Eighth Circuit gave us more in Union Electric v. AEGIS Energy Syndicate. The policy had a mandatory arbitration provision, but an endorsement specified that Missouri law governed and a Missouri statute prohibits mandatory arbitration of insurance disputes, so while the carrier wanted to compel arbitration, Judge Jean Hamilton refused and the Eighth Circuit affirmed her decision. So, the drafters may have intended that any disputes would be arbitrated, but if so, they should have done some more homework.
There are a couple of lessons here. First, read the entire policy, including the endorsements. The endorsements are like change orders to construction contracts and until you've read them, you don't know what the policy provides for. Second, just because a policy (or any other contract, for that matter) says something doesn't mean it has to be. Many common contractual clauses are rendered unenforceable by either caselaw or statutes. Third, because insurance policies are governed by state laws, and in light of the differing interpretations and statutory schemes amongst the states, there can be wide variations of the procedural and substantive effect of policies depending on what state's law governs. So, do your homework.