Just launched - Rad Uploader not working

Hi,

I'm having a problem. I've just launched a site using 4.2 - the site has been running in a different server for about 1 year. Now that I've moved it to a new server I cannot get the RadUploader to work. I am using the database to store all assests, and I have given full permissions to the App_Data/Sitefinity folder plus am running in Full Trust.

No SiteFinity log files are being produced telling me there is an error.

Can anyone help out? Im at a loss as to how to diagnose this one!

Thanks in advance
Al