DP isn't the only application using the CBT table. If your previous backups are still valid then probably there is corruption in the CBT table or something else has changed it sufficiently so that DP cannot read it anymore. Check with your VMware Admin to see if anything else is running that is updating/reading/changing the CBT table. Also if you vmotion your VM to different storage then the table is no longer valid and a new full will be triggered so maybe check this too
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