Yes for every instance you create it will add the necessary tab to the navbar. So un tick the active status of the tab you made and try to create a instance.
Confirmed that once an instance is created, make sure you select "can view gallery". This was not selected by default. Once selected, the tab will appear.
He has a older version of NavTabs I still have not released a update for it. With that being said, now if his tabs he makes with NavTabs mod are still showing up on the system, maybe the navbar template for the style did not get reverted, and is still using the old system. I dunno though, only a guess.
True, GoodApples, we need to know what version of vB you're doing this on before we can really go further. With vB4.2 we have a whole different set of issues we're dealing with so if it's vB4.2 we'll go one direction with the troubleshooting, if less then 4.2 a different direction.
Ah, if you are seeing that text you have the wrong xml file installed. There was a problem with the server earlier that dished out two versions of the product xml. A 43kb one that is the wrong one and the 140kb one that should be installed. I checked the files and the dragonbyte_gallery.php reference is only in the bad one.