You can monkey patch qTranslate to fix the issue.
https://github.com/funkjedi/acf-qtranslate/issues/2#issuecomment-37612918
add_action('plugins_loaded', 'qtranslate_monkey_patch', 3);
function qtranslate_monkey_patch() {
global $q_config;
if (strpos($q_config['js']['qtrans_hook_on_tinyMCE'], 'ed.editorId.match(/^qtrans_/)') === false) {
$q_config['js']['qtrans_hook_on_tinyMCE'] = preg_replace("/(qtrans_save\(switchEditors\.pre_wpautop\(o\.content\)\);)/", "if (ed.editorId.match(/^qtrans_/)) \$1", $q_config['js']['qtrans_hook_on_tinyMCE']);
}
}