Hello, This seems like a very minor bug, but I thought I'd report it anyway in case it has wider ramifications that I'm unaware of.
Create an org file with the following lines: | 1 | #+TBLFM: $1=2 Open it and type C-c C-c on the TBLFM line. This replaces the '1' in the table with a '2'. Now type C-_ (for undo). Not only does the '2' revert to a '1', but a second line reading '#+TBLFM: $1=2' is inserted directly under the first. An second C-_ removes this second TBLFM line. Regards, Paul PS. I'm using Emacs 24.2.1 and Org-mode release_8.0.3-331-gf7e6f1 and I tested with the minimal org-mode set-up from http://orgmode.org/manual/Feedback.html.