JoomlaPlug!

Hi,
Recently used Clone to move a site (1.0.15) from a test to live server - all went very smoothly except for the transfer of images, when it flattened the directory structure. But I just moved the images folder over manually, so that resolved that issue.

However, I now have the problem that I keep getting kicked out of the Admin on the live server - I can't do anything. Each time I login & try to save something, I'm kicked out straightaway. Then I have to wait to log back in, only to be kicked out again.

I suspect that it might have something to do with ftp file permissions? Is it possible that the files that Cloner moved over are not owned by the ftp user on the live server? Using an ftp client, I can't, for example, delete/overwrite any of the joomla files/directories.

I thought that if it was a permissions issue, I could just put a fresh administrator directory/files on the live server, and these would then be owned by the correct ftp user. Unfortunately, this hasn't worked - perhaps I'll have to manually copy an entire fresh Joomla install over?

Any suggestions?
Thanks, Eddie