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"Delete before import" does not delete all existing programs. It deletes the programs that are detected as overlapping with the new guide data. It is possible there is a bug in that functionality, but crucially there is no difference in the delete code that runs for a forced import (compared with an auto import). If a forced import solves the problem I'm far more inclined to suspect that the auto import fails for some other reason.

Are there epg.log files that go with the tv.log files?