Image ALT and Title field translation cache problem

Hi,

I have an Issue while trying to translate my alt and title tags. I use entity translation and media together on a three language site. I also use boost, although it should not cause any problems. I have already patched media from here. I learned that If i select different languages the alt fields are not translated in the html code.
However If I empty all caches (page and else) all alt field are translated to that language that was the current one when I emptied the cache. I need this to work properly :(

Do you have any Idea on the issue?
Any help appreciated.

Hefterbrumi