No successful initialization of the delta took place

This morning I am suddenly getting this error in many of my process chains;

"No successful initialization of the delta took place"

I'm baffled as I can't think of anything I changed in the system since the last successful day which was Friday morning. This message is not very useful; all of the 10+ infoproviders that have failed (with same message) have been working for a long time and have indeed had successful delta initialization requests so this makes no sense.

Anybody experience this or now what I should look into to fix this? I tried rerunning immediately in foreground and I get the same error.