Incremental backups doing full backup

Virtualmin Theme version: 6.8
Virtualmin version: 3.67
Operating system: CentOS Linux 5.3
I have two scheduled backup jobs, full backup on Sunday, and incremental Monday through Saturday. Was working fine.

On March 29, I upgraded to Virtualmin 3.67. The incremental backup on the 30th was fine, but after that, started getting a full backup on every site from the incremental job.

On April 1st, I upgraded to CentOS 5.3... no change, incremental backup is still backing up every file, even though some of the files have not been changed in months.

The scheduled backup jobs have not been modified; I did verify that the incremental job IS set on "incremental", and the log from the job does say "Creating incremental TAR file...", yet the tar file sizes are the same as the full backup. Prior to 3.67, they were tiny by comparison.

3.67 was installed prior to the scheduled full backup run; wanted to start a "clean" week with the new version.

Anything I can check to debug this? Thanks.

Closed (fixed)