Bug concerning tables

Hi all

I am writing to report a bug in Amaya 6.4 (under Windows). If I have a
.css file that contains just the lines:

th.br { border-right : solid thin black }
td.ur { border-right : solid thin black }

then, if a have the table

<table>
<tr><th class="br">a</th></tr>
<tr><td class="ur">b</td></tr>
</table>

when I see it with Amaya the result is right, that is, I get the table:

 a|
 b|

However, if I add the line

td.r { border-right : solid thin black }

at the bottom of the .css file, instead if geting the same result (as I
should), the vertical bar at the right of the letter "a" disappears.

Best regards

Jose Carlos Santos