After having downloading numerous MB wu's, got a further 10 AP wu's.

Does MB take priority over AP?

All AP wu's have a deadline of 29/6 while the MB wu's have a deadline of 21/7 or later, yet the MB's are running in high proirity mode.

No, it's not a difference between AP and MB. BOINC just does a round-robin simulation to see if all the tasks would complete before their computation deadlines (report deadline less the time of cache you've told it to maintain). If that shows a danger, something like the first task which might miss is chosen to go into high priority. It isn't really an Earliest Deadline First approach any more.

BOINC 7.0.25 has a bug related to High Priority and projects like this one which send the <dont_use_dcf/> element in a sched_reply. I haven't followed that in detail, but 7.0.28 has the fix from changeset [trac]changeset:25619[/trac].

                                                                   Joe

Thanks Joe. Updated to 7.0.28.