Try gav's latest image (search the DBOX forum for the link as its not yet available in the downloads); which is apparently known to be good for scanning.
Otherwise, have a look in the "Services.xml files in here PLEASE" thread in the download sections, look for anything in general that is near your area.
Also, it may be possible that you have gone over to VOD - if this is the case then you will not receive the front row channels. I dont think you;'re VOD yet so somebody might be able to confirm this?