I tried updating my BOINC client to version 7.0.40 and completed tasks would not upload. Message tab said anonymous platform not supported. Different message that you get now that is ignored so if you're using an app info file do not update. Switched back to 7.0.36 and all is working again.
EDIT: Here's what the error message looks like.
World Community Grid | Message from server: This project doesn't support computers of type anonymous
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