Hi Diego,
I don’t know if there really are any compatibility issues, but I seem to have worked around it. I edited qtranslate_wphacks.php and changed the wordpress version in the line:
if($GLOBALS[‘wp_version’]!=”2.6.2″) {
to 2.6.3, and it runs again. I suspect that’s all you need do, but I’m no expert on WP or qtranslate, so take that advice at your own risk!
Tony.