On Nov 20, 2011, at 7:19 PM, YAMAMOTO Mitsuharu wrote:
>  Then, the second line is displayed as `b' instead of `2'.

Because nobody else replied:  I reproduced it easily and was shocked too see this.   Please do fix this bug before the next release.

I have, lately, seen an occasional and elusive problem with the display of header lines (or the lack thereof) and am now wondering if this could be due to the same issue.  I'll wait and see.