I used to run climate@home on my Win Pc for a number of months and actually completed a couple or more of workunits and well as aborting a few. After my PC died I replaced it with an iMac(Intel) and then was not allowed to download any workunits until last week.

To my surprise all credits for my previous workunits seem to have vanished. Is this unusual?

Not unusual if you create a new account here instead of attaching as an existing user to an existing account.
And, as there is no sign of any old computers, Win or otherwise, I\'d guess that that\'s what you\'ve done.

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Backups: Here