I've had that problem also, for about the last month or so. (Never had the problem before that, so hopefully it'll go away again eventually.) If it's a small file you're updating, like just an HTML file or small graphic, just repeat the upload 2 or 3 times and it'll immediately show the updated version. Usually twice is enough... just refresh your page to see if it's showing the updated version, and if it isn't then simply upload the file again (in the same FTP session) and it should work. It's inconvenient and takes a few extra seconds, but seems effective. Unfortunately, with a large number of files or with very large files it's a lot more inconvenient. Usually with large files I just wait and hope it'll show up after a few hours (which it usually does).