It’s the same as the textbutton I just inserted a imagebutton and copied over my textbutton contents.
Make sure the imagebutton isn’t covering up the viewportframe, so turn the imagebutton off and see if the viewportframe shows.
I’m still confused because it’s the same from the textbutton it should be working for that as well??
The only thing left to say is if you could provide us the Container and both the Image and Text buttons to see the problem for ourselves.