Ok sorry if I wasn't clear enough.
Each time I try to download a file through Opera which is the size of 1.2 MB, everything works fine until I download the file.
There, I can only get like 300 KB, the download does not complete at all.
It only shows this behavior in Opera.
I have another file which is smaller and there it works fine.
Hope this helps.
I can send you a link if necessary.
To your email ?