I think I'm having the same problem too.
I've created a WordPress site with 6 languages: English (Main), Norwegian, Slovenian, Polish, Turkish and Bulgarian.
So far I've only filled in the English and Norwegian pages but some strange things have happened.
On one occasion, I returned to the Norwegian page only to find that it now contained the English followed by the Norwegian Content.
Since then I've updated to the latest qTranslate (formerly, I had: qTranslate 2.5.27)
Then on three separate occasions, I've saved pages only to find that the Norwegian content has been completely replaced by the English content.
As an occasional test, having created my two pages, I'll open and save them in English Visual, Norwegian Visual, English HTML and Norwegian HTML. Each time I'll check the appropriate web page to see that it hasn't altered. I do this because I'm aware of the way WordPress can strip away div tags, line spaces, etc.
The weird thing is that I can go through all these tests several times without any problems occurring, then suddenly the Norwegian text turns to English.
Please, no one suggest that I disable the Visual Editor. My customers are not programmers and expect to use the Visual mode for general page creation.
I haven't tried deactivating and activating the plugin a dozen times yet. I will do and let you know if it works.
Anyone else got any news?
PS. I'm using Artisteer.220.127.116.11375 to create the theme, qTranslate 2.5.28 and Wordpress 3.3.1.
Other installed plugins are: Permalink Fix & Disable Canonical Redirects Pack, Premium Slider and WordPress Database Backup
I have an iMac running OSX 10.7.2. I use Safari Version 5.1.2 (7534.52.7)
Also, following advice about Home page reverting to English problem, I've amended navigation.php from get_option('home')
Finally, I've also followed the advice of a post on this site "Again Home page get back to the default language (qTranslate" (02/02/12)
and added the extra code to functions.php