In my cc_config.xml, I have...

<options>
<zero_debts>1</zero_debts>
</options>

...amongst other things. Now, possibly several updates later, I have started to get a message, (a "Notice"), saying that this is not recognised. I don't know when this "Notice" first appeared, but recently needed to use it, and found...

<zero_debts> flagged as unrecognisable.

Simple question, how do I get this functionality now?

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Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.

Good question. <zero debts> has been deprecated, because debt itself has been superceeded as a scheduling mechanism.

But now, how do we reset REC and Prio when the need arises (after a testing session has gone haywire)?

The following advice is best followed by Advanced BOINC users only.

But now, how do we reset REC and Prio when the need arises (after a testing session has gone haywire)?

Run cache down, upload & report everything.
Make a backup of your BOINC Data directory, of all files and sub-directories.
Next exit BOINC, then delete both client_state.xml and client_state_prev.xml in the data directory.

This doesn't reset the values on the BOINC server, so it's possible your Prio value gets downloaded again as soon as you restart BOINC and a new client_state.xml file is written. That though depends on the server version the project is wielding. At least your REC is now zero.

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These are my machines and I will have them do what I want them to do, and when they do it. I know when my various machines are going to be available and/or contactable. BOINC does not.

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Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.