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A workaround is posted on the Mma stack exchange: http://mathematica.stackexchange.com/questions/56132/plotmarkers-problem-in-errorlistplot-mathematica-10 In my experience, the workaround Method -> {"OptimizePlotMarkers" -> False} ...
It is a documented form. Under "details" on the documentation you linked the third bullet is: IsotopeData["name"] or IsotopeData[Z] gives a list of all known isotopes of the element with the specified name or atomic number. ... and I guess I...
Thank you both for your responses, I think they have helped me learn enough to almost solve, but then need to refine my question. Suppose I go to the Mma preferences and click "Reset to Defaults" in the Parallel tab. Then, when I...