Yes, I have emailed technin@mweb but this did not help. I also tried it on two other accounts and it does seem that broken files are cached. Will check again tonight and if it still is not working I will PM you.
Why does the proxy cache broken files to begin with ?
We're not able to see a problem in this area, which is why I need your examples to replicate and verify your findings. If I'm able to do so then I can take the matter further. Please could you PM me some examples of specific files you've had a problem with in the past and some detail of how you downloaded them, was it direct http / ftp, with or without a download manager, which browser did you use, etc. This will give me a starting point for fault replication.