Hi Shauno. I think i got it.
Normally to make a multilingual site with qTranslate one must wrap the content we write in special tags eg:
Then the plugin only shows the content language based on the browser language.
This works great with almost all plugins i have except NextGen Gallery, and now with NextGEN custom fields.
I think the problem is with NextGEN because from what i have read it doesn´t play well with qTranslate.
After a lot of reading i figured out:
<?php echo nggcf_get_gallery_field($gallery->ID, "Custom Field Name"); ?>
one must change it to:
<?php echo __(html_entity_decode(nggcf_get_gallery_field($gallery->ID, "Custom Field Name"), ENT_NOQUOTES)); ?>
I´m not a PHP pro so i don´t fully understand this code but it works.