I'm sorry I forgot to give you my e-mail:
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.
Anyway, the fix isn't difficult. Edit file /components/com_sef/joomsef.php and around line number 1284 find following lines:
if (isset($langRoute)) {
$oldUri->setPath($langRoute);
}
and change them to:
if (isset($langRoute)) {
$base = rtrim(JURI::base(true), '/');
$oldUri->setPath(rtrim($base.'/'.$langRoute, '/'));
}
Of course make a backup of the file first, in case something goes wrong.