Arrow symbols missing when assigning roles (See screenshots). Initially we found that the arrows are missing in a lot of places in Firefox on a Mac. Then we found that a part of an arrow in Safari (both PC and Mac) are missing as well.

Here is a proposed fix:
in /lib/weblib.php (at around line 2834):

[original]
        if (false !== strpos($uagent, 'Opera')
            || false !== strpos($uagent, 'Mac')) {

[suggest change to]

    if (false !== strpos($uagent, 'Safari')
|| (false !== strpos ($uagent, 'Firefox') && false !== strpos($uagent, 'Mac'))) {
            // Looks good in Win XP/Mac/Opera 8/9, Mac/Firefox 2, Camino, Safari.
            // Not broken in Mac/IE 5, Mac/Netscape 7 (?).
            $THEME->rarrow = '>';
            $THEME->larrow = '<';
        }
elseif (false !== strpos($uagent, 'Opera')) {
            // Looks good in Win XP/Mac/Opera 8/9, Mac/Firefox 2, Camino, Safari.
            // Not broken in Mac/IE 5, Mac/Netscape 7 (?).