The wordwrap in the ticket display corrupts the text. Sometimes a <br /> is split before /> resulting in these two characters being displayed in the message.
My fix, reseller/view_ticket.php, line 137:
$tc = nl2br($rs->fields['ticket_message']);
$tc = preg_replace("/(\r\n|\n|\r)/", "", $tc);
$tc = preg_replace("=<br */?>=i", "\n", $tc);
$ftc = "";
foreach( preg_split( "/(\r\n|\n|\r)/", $tc ) as $line )
$ftc .= wordwrap(html_entity_decode($line), round(($screenwidth-200) / 7), "\n", 1 )."\n";
then replace
'TICKET_CONTENT' => wordwrap(html_entity_decode(nl2br($rs->fields['ticket_message'])), round(($screenwidth-200) / 7), "<br>\n", 1),
below with
'TICKET_CONTENT' => nl2br($ftc),
The first step makes sure, that we only have <br>s in the text, the second step filters out "\n"s that might be introduced by nl2br, the third step filters out all possible types of <br> (in case the used added <br>s to the text himself).
Then all this is splic on "\n"s and every line is wordwrapped.
I guess of the first three steps not every single one is required, but it doesn't hurt. Same goes for client/view_ticket.php