queXF 1.8.1 has been released today on Sourceforge
Click on Read more for how to upgrade
To upgrade from queXF 1.8.1 - do the following:
1. Backup config.inc.php (copy to config.inc.php.bak)
2. Extract the new package over your existing installation of queXF 1.8.0
3. Copy your config.inc.php.bak file over the extracted config file.