We've got MRP installed, but I can't see it in the home screen. It is listed as installed in the list of apps/modules, so I'm not sure where to start looking for problems next. 

Inventory module, contacts, calendar all work fine. We are only accessing via companyname.odoo.com

I have no idea what other information might be useful. We are a new customer still setting up our account and need to start building our product BOMs.