We have a Sharepoint test server which uses SQL Server 2012 on Windows Server 2012 Standard, protected by DPM 2012 R2.
At some point in its history, the recovery model of some of the databases was changed from full to simple and back to full again in order to clear down transaction logs which had filled all the available disk space.
DPM recognises that these database are in full recovery mode, and we are able to create incremental recovery points manually. However DPM will not schedule regular incremental backup jobs, although it does successfully schedule and run full backup jobs.
We have tried refreshing the cache and removing and re-adding the databases to the protection group, but this has had no effect. The jobs are not failing, they are simply not being scheduled in the first place.
I have noticed that there are some suspended jobs on the DPM back end database, which may or may not be relevant.
Incremental recovery point jobs are running successfully for other databases on the same instance.