Remember to cover the basics, that is, what you expected to happen and what in fact did happen. You don't know how to make a good report? See
http://orgmode.org/manual/Feedback.html#Feedback Your bug report will be posted to the Org-mode mailing list. ------------------------------------------------------------------------ If I create a table formula to subtract two durations: (e.g. $6=$5-$4;T), if the answer is negative (e.g. The value in column $4 is larger than $5), it is wrong. Emacs : GNU Emacs 23.3.50.1 (i386-apple-darwin9.8.0, NS apple-appkit-949.54) of 2011-10-25 on braeburn.aquamacs.org - Aquamacs Distribution 2.4 Package: Org-mode version 7.8.03 (release_7.8.03.421.g61f83.dirty)