Vendor's name not displaying in profile ("Add Vendor" instead)

I've noticed that over the past few days, when viewing a vendor's profile, XTRF no longer displays the vendor's first and last names in the upper left hand corner. Instead, it displays the words "Add Vendor," as shown below:

This seems to be the case regardless of the vendor's status, whether the vendor is an individual or company, or any other variables. 

Any ideas why this might be happening, and how I can fix it? Thanks!