Sounds like either a conflict or corruption, have you updated any software recently? Have you installed any plug ins or new fonts?
I am actually helping a user no updates have been made or plug ins. I was reading a comment about 4 years ago " I am using Illustrator 11.0. I have gone to the window menu and selected Appearance, but the palette does not come up. The check mark appears under the window menu as if the palette were visible, but it does not appear. Does anyone know why this would be?
Answer Unless you have some dual monitor fun, you may try the easy and dirty, FAQ #2, or the reversible way, to Move the folder http://www.bugge.com/Family-and-friends/Illy/illy.html
Never mind the last post about the dual monitor. Deleting the prefs file worked. Thank you so much
I am not sure what's the prefs file to delete.