|Message: Re: New day, substantially different answers||Not Logged In (login)|
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From the information, which you provide, it is impossible to guess what could be the reason for the change of your results. It looks like you either change something in your source code or there is a problem which causes an instability of results.
To avoid such surprises, it is good to track the changes in your source code in some CVS system (svn or git) together with a test outputs, so that you can be sure that you compare the results got from the same versions of everything.