Can't refresh or use "newest emails only" option

I can do a full backup OK, no probs.

But if I use "newest emails only" option, then I get the sequence:

GMail Backup revision 691 (2009-02-20)
Starting backup of account domgill@gmail.com into S:\GmailBackup
Starting backup of labels
Backup of labels ended
Ending backup of account domgill@gmail.com

and no emails are backed up, only (apparently) the labels.

What has happened? I have uninstalled and reinstalled the latest version. Same result.

It seems that the only way I can refresh my backup is to wait for it to SKIP about 98,000 entries.

I seem to remember this used to be OK.

Can you help, please?

dom
domgill@gmail.com