Mapnik has problems rendering mixed arabic/european text with brackets. see OSM-nodes id=297115870 and id=316791019. Osmarender has only a problem with one of these nodes. JOSM has this problem also. I posted that already at the JOSM trac site. Browsers (IE and Firefox) do not have this problem, see http://www.openstreetmap.org/browse/node/297115870.
[Ldp] Marking as likely duplicate of #364. Comments can be made there.