Looks like version 3.5 will let us run more than once on each box, so back to the old way of one instance for each CPU or virtual CPU.

Below is from an email from Danail. I emailed him when 3.4 gave us this issue

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Gary - thank you. This was a very important comment. We had to compile a new
version (3.5) to get rid of the bug. I appologize in the name of the whole
Oxford team.

Could you please post this excuse on the Free-DC site and add a short note
to announce the version 3.5 ?

Many thanks, Danail

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a very nice person!!

Look out for the update