I noticed that (very oddly) it works if you remove the button in question from the toolbar and then re-add it. Not really a viable alternative, but may help track down the cause...
-- Merge and center cells not available when cells are selected with mouse https://bugs.launchpad.net/bugs/534360 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs