Sorry to come back to this one but I'm still unable to upload from my home network machines. If I disable Flash in IE my site reverts to the "old" upload page, as it should, but if I upload a file from there as soon as I hit Submit I get "Internet Explorer cannot display the web page". Uploadphoto.php is displayed in the title bar at this point. So the problem doesn't seem to be with swfupload

Neither upload method is working. Since it works from a laptop with 3G modem I am assuming the server end is OK but I just can't see what the problem is at home.