Hi,
my problem is this

18/08/2012 08:59:57 | malariacontrol.net | Sending scheduler request: To report completed tasks.
18/08/2012 08:59:57 | malariacontrol.net | Reporting 584 completed tasks, not requesting new tasks
18/08/2012 09:00:32 | malariacontrol.net | Scheduler request failed: Server returned nothing (no headers, no data)
18/08/2012 09:00:44 | | Project communication failed: attempting access to reference site
18/08/2012 09:00:45 | | Internet access OK - project servers may be temporarily down.

I suspended malariacontrol because there are not 584 completed tasks ready to send.

what can I do?

are the servers really down and I must wait?

Thanks for your help
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According to the server status page everything is up, and my most recent successful scheduler requests (08:44:53 and 13:02:24 UTC) agree with that.

Is your problem with your Q9550? If so how many tasks does BOINC Manager's advanced view have listed for MC? That computer was obviously sent an excessive number of tasks on 11th August (there are 173 tasks listed as timed out and it's possible there are more which already been purged by the server).

If it wasn't that computer or there are less that 584 tasks listed the discrepancy is most likely due to memory corruption. If that's the case I'd try restarting BOINC and a reboot if that doesn't fix it. It might also be a good idea to run a memory test (e.g. Prime95's Torture Test).
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"The ultimate test of a moral society is the kind of world that it leaves to its children." - Dietrich Bonhoeffer

Thanks for your answer.
It was the Q9550 having that problem. I downloaded BOINC, then removed the project. CPDN was still running fine. Then added MC again.

All is running fine at the moment.