I created several sprite collections, and they were working fine. I wanted to add a few extra sprites to one collection, so I locked the collection in the inspector, found the sprites and dragged them onto the texture refs. They were added okay, but I no longer have the Commit button to save the collection. The edit button is also missing, and neither change when I unlock the collection in the inspector.
As I look through the other collections, which I have not touched, none of those have a Commit or Edit button anymore either. I have closed my Unity project and reopened, but the buttons are still missing.
There are only two components on each of my collections - a Transform, and a Tk 2D Sprite Collection script.
If I create a new SpriteCollection, it is also missing the two buttons. I also reimported the tk2d resources and still have the issue.