upload terminated - connection closed

Hello,

all of sudden now I have this problem with most of my connections and I didn't use to have it before I update to this new version. I was wondering if anything might have gone wrong during the updating process?
I cant upload more than 7MB to a site where I used to upload 50MB+ files, and I get disconnected when downloading from other sites.

I have checked my favourites preferences and made sure they were all set the same (since a few things have changed in the favourites preferences).
There is no error code but a message saying in red that either there was a problem in the host computer, or there is no space left in the host computer, or something about socket I can't remember that one exactly right now.
Should I try to uninstall the program and re-install it?
What could be wrong?

Thanks.

..I should say that I tried also changing the settings for my sites from PASV to PORT etc, the other stuff in preferences to see if they would make the transfer work to no avail. So I beleive something's wrong on my end and that's not related to the program settings.