AE menu option is not valid

[Julieta5D24]

Hi everyone! Recently I have this annoyance which dont let me access to any menu (file, window, none) someone knows how to solve it please? I would highly appreciate. Thank you!! 

[Justin T - Hyper Brew]

I got that a lot for a while too, but I think it went away recently. Have you updated to the latest version of AE?

[RobShultz]

Are you sure that you're using the Selection (arrow) tool?

[ToolfarmJP]

You try this.

Window menu > Workspace > you choose somthing else which you do not currently choose.