[StarCluster] No route to 0.0.0.0/0

[Chad Nicely]

I'm trying to launch starcluster instances into a subnet in a non-default
VPC which satisfies the documented requirements (internet gateway attached
to the VPC and a route to 0.0.0.0/0), but I'm still getting the error "No
route to 0.0.0.0/0 found for subnet".

The associated route table looks like this, and I've triple checked all ids
and associations:

{
    "RouteTables": [
        {
            "Associations": [
                {
                    "RouteTableAssociationId": "rtbassoc-xxxxxxxx",
                    "Main": true,
                    "RouteTableId": "rtb-yyyyyyyy"
                }
            ],
            "RouteTableId": "rtb-yyyyyyyy",
            "VpcId": "vpc-aaaaaaaa",
            "PropagatingVgws": [],
            "Tags": [],
            "Routes": [
                ...
                {
                    "GatewayId": "igw-bbbbbbbb",
                    "DestinationCidrBlock": "0.0.0.0/0",
                    "State": "active",
                    "Origin": "CreateRoute"
                }
            ]
        }
    ]
}

I'm running starcluster v0.95.6. Any ideas?
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