We recently released a managed package, and came across a strange issue. We have overridden a custom object Tab with a Visualforce page. When I click on the Tab, the page shows up as normal, but the Home tab is "selected" and not the Tab I just clicked on. This is the only tab this is happening with, none of the others are affected.
As you might imagine, this leads to a very confusing user experience. I checked that the tab has "Default On", and the object has CRUD permissions, but this is happening to both Administrator and Standard Users. Has anyone experienced this before?