Definitely!! Also, how many of the 16 "CPUs" does BOINC have access to, how many of those ARP1 tasks did it try to run at the same time, and is it also running work for projects other than WCG at the same time???

It's harder to give help here than on a lot of other BOINC-based projects because we can't see computer details or workunit details for other users -- debugging with too much guesswork makes for longer threads and slower solutions! So the more information in the original message (within reason!), the better... :-)

Cheers - Al

One further question. You said it downloaded 8 ARP units. At what point did the error occur? If they all started running at the same time they might have been trying to checkpoint at the same time and that could cause "indigestion" do to the high workload at checkpoint.
I try to keep checkpoints and finish at least 2 minutes apart by briefly suspending the second one. It doesn't matter which checkpoint we are talking about, they are all a problem capacity-wise. They occur at each 12.5%.
Mike

Thanks for the many replies. The PC was running only 1 Open Pandemics work unit and 1 to 2 ARP units at the same time. The other ARP units were still in the midst of being downloaded. Here's the error log from one of them:

<core_client_version>7.16.20</core_client_version>
<![CDATA[
<message>
An unexpected network error occurred.
(0x3b) - exit code 59 (0x3b)</message>
<stderr_txt>
INFO: Initializing
INFO: No state to restore. Start from the beginning.
Starting WRFMain
forrtl: severe (59): list-directed I/O syntax error, unit 28, file C:\ProgramData\BOINC\slots\1\ozone_lat.formatted
Image PC Routine Line Source
wcgrid_arp1_wrf_7 00007FF6255FDB98 Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF62563758A Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF6256359C9 Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF6264C35FE Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF6257FDAEF Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF625802768 Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF6250C35FB Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF624F8EB96 Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF624EB4AD0 Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF624309D5A Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF6243087B4 Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF624234372 Unknown Unknown Unknown
wcgrid_arp1_wrf_7 00007FF6267F9BF4 Unknown Unknown Unknown
KERNEL32.DLL 00007FF80F6E54E0 Unknown Unknown Unknown
ntdll.dll 00007FF81096485B Unknown Unknown Unknown

</stderr_txt>
]]>

That error log suggests there might be a corrupt data file. Check the results pages again to see whether any wingmen are failing or not; by what you said in your original post, they'd probably fail pretty quickly!

If they are failing, there's probably something wrong with the original workunits (and there's nothing much we, as users, can do about that!) -- if they aren't reporting errors then the problem lies elsewhere and someone may have some more ideas as to why yours fails when others don't.

Cheers - Al.