I'm experiencing a strange conundrum where I have several available Great Art slots, but when I go to use my Great Artist to create the great work, the option to do so has mysteriously disappeared. Now the only option that I can see is to start a Golden Age. Is this some kind of bug or is there a limit to how many Great Works of Art I can create? My game is in the year 2044 (yeah, culture victory is taking forever) and I've researched the Internet. I'm kind of confused here, anyone else that's had this happen to them, or do I not understand something?