First, I am not referring to the link to the MasterPage gallery, I can get there just fine. The link I am referring to is under look and feel (when publishing Feature is activated).
I can navigate almost everywhere on the site. The account I am using is added to user policy with Full Control, it is a site collection admin and it is granted Full control on the web level.
I have confirmed that all masterpages have "published" versions (XX.0).
My client originally called with the fact that only non-admin users could access the site, Admin users were not granted access. I resolved that (not 100% sure how it resolved, but by investigating, it started to work)
I don't have any insight into when or how this occurred. The reported symptom was that they disable the Minimal Download strategy feature and it "broke"
Does anyone have any additional thoughts?