I would expect that you modified app_info or made other changes on Sept 16 that deleted your entire cache. That would make those files sit on the server until they time out.

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Well, this did happen to you: http://setiathome.berkeley.edu/forum_thread.php?id=76881&postid=1726326#1726326

You lost all your WU's when using backup image. Servers don't resend them, You just got new ones.

Does anyone know when the invalid tasks will be flushed out along with the validation inconclusive

The inconclusives will never all be gone as there are so many combinations of hardware & software that there will always be some inconclusives around.

As for the Invalids, it will take time to flush out all of the WUs that are automatically Invalid- easily a couple of months.
However the vast majority of them have already been processed, and the number still to be processed has dropped drastically, so while you'll still get the odd one or 2, there won't be many more. Barring further incidents.
But there will still be some floating around for another month or 2 and you may or may not be unlucky enough to get one.

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Grant
Darwin NT

The invalids should be flushed 24 Hrs after they have been processed by the 10th machine, that machine will be given a status of " Completed, can't validate" and the errors line will show "Too many total results".

Untill then all you can do is wait.

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Kevin