Has the "Visual version comparison" been removed from Grabcad?

I no longer see the compare icon on the 3d viewer menu. Is it just hidden somewhere or no longer available?
:(

I had to check the guide to make sure I wasn't just imagining that I had used this previously: https://grabcad.com/tutorials/how-do-i-track-changes-by-others

I do have a file with V1 and V2 versions. I also tried adding the "Mark as Revision" option from the file menu. Still no compare option.