Here is the problem:

NO_SIM_ANNEAL_BARCODE_30_1dtj_246_3599_0
Workunit 5784401
Created 17 Jan 2006 20:59:45 UTC
Sent 17 Jan 2006 21:08:39 UTC
Received ---
Server state In Progress
Outcome Unknown
Client state New
Exit status 0 (0x0)
Computer ID 140452
Report deadline 14 Feb 2006 21:08:39 UTC

I have removed this WU from my computer but the server seems to ignore it.
If useful my computing mate is a Mac G4, running with OS X, BOINC client version 5.2.13

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Once the deadline expires the task will be given to another host.

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BOINC WIKI

BOINCing since 2002/12/8