I too have a problem since upgrading to 175. It just stops working. No messages to indicate anything might be wrong, it just stops downloading and uploading. I have changed nothing on my system other than the upgrade. It worked fine for a couple of days then would stop. I'd run all my anti-virus, spyware etc. reboot and it would work again for a day or so, then stop. But now, after a couple of weeks, nothing I can do (even a re-install) gets it going again. It would seem that judging by the number of people also having problems there must be some bugs in 175. What can one do? Maybe try another programme like Bit-torrent? Any suggestions anyone?