I was about half way through a 400 hour climateprediction work unit & upgraded from BOINC v4.05 to 4.09. After the upgrade, my BOINC software hung. I have now managed to downgrade back to v4.05 but my cimateprediction work unit is gone & the software is .02% though a new work unit.

Is my old work unit lost?

Unfortunately, the only way of recovering a WU in this situation is from a backup. Given the problems a few people have experienced in upgrading, the advice has to be to make a backup of the entire BOINC directory before upgrading, and regularly besides. If things go wrong, it should then be a simple matter of copying the directory back.

> Unfortunately, the only way of recovering a WU in this situation is from a
> backup. Given the problems a few people have experienced in upgrading, the
> advice has to be to make a backup of the entire BOINC directory before
> upgrading, and regularly besides. If things go wrong, it should then be a
> simple matter of copying the directory back.
>

Thanks for your reply

Regards
Nick

Also note that if you are also running S@H, you will not be given any more work if you are using CC 4.05.

<a href="http://www.boinc.dk/index.php?page=user_statistics&amp;project=cpdn&amp;userid=355"><img border="0" height="80" src="http://355.cpdn.sig.boinc.dk?188"></a>

&gt; Also note that if you are also running S@H, you will not be given any more
&gt; work if you are using CC 4.05.
&gt;
&gt; <a> href="http://www.boinc.dk/index.php?page=user_statistics&amp;project=cpdn&amp;userid=355"&gt;<img> border="0" height="80" src="http://355.cpdn.sig.boinc.dk?188"&gt;</a>
&gt;

That's a good point. However v4.09 is unstable on my system, it simply will not run. I now have both network pcs running v4.05 problem free - apart from no Seti units. I'll wait for a new version before trying an upgrade again. BTW My processor is running in HT mode.

&gt; v4.09 is unstable on my system, it simply will not run.

Then why not try 4.13 ?

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