I have some updates about this issue. I can confirm that it is not related to the prettification. I tried to directly put in unicode symbols instead of the ones generated by prettification, and I got exactly the same issue.
So I guess this has something to do with how the system is handling the non-latin symbols. It looks like these greek letters are displayed to be single-width symbols but counted as double-wide ones. Btw, I am using a fixed-width font, and the greek letters does not cause alignment issues outside tables. Jiang > On 2016年8月31日, at 01:25, Eric S Fraga <e.fr...@ucl.ac.uk> wrote: > > On Tuesday, 30 Aug 2016 at 18:12, jsj wrote: > > [...] > >> | a | b | c | >> |-------+---+---| >> | α β | | | >> >> Is it just me or you can reproduce the same behavior? > > I have seen the same at times. Not always so it may be font > related. Not sure. > > -- > : Eric S Fraga (0xFFFCF67D), Emacs 25.0.94.1, Org release_8.3.5-1070-g190476