Is views cache filter sensitive? (language different but treated as same page)

I have been trying different cache solutions which haven't worked so well for me so far.

I found views cache and it could be the answer because my site uses theme switching, and different views built from arguments.

When I got views cache working it was great, but my views display based on the language setting.
When the views cached they didn't recognise the difference between the language filter, so it destroyed my multi-language views.
It did recognise arguments though for different pages.

Is views cache filter sensitive?
Does the dev version handle the language filters?

Is there a technique to get to treat the language as a different view?