Go back no longer works

[Bob Sneidar]

Something very odd has happened to my Livecode Install. The command Go Back no longer works. Was working up until about a half hour ago. To test it I created a new stack with two cards, each marked card 1 and card 2 respectively. In the first card I have a handler in the card script 

on openStack
go card 2
go back
end openCard

I end up on card 2. Ideas??

Bob S