VM's unable to see vmfs datastore on host

I have 2 VM's v.10 that are unable to see/connect to a vmfs datastore on the host in the web client. The host is 5.5 and I have 2 other hosts and vm's that are 5.5/v.10 that can see the datastore fine and can see it in vcenter 5.5 fine.  This is a utility datastore shared across hosts on which we keep ISO resources that was originally formatted on a 5.1 host.