ResultsViewer-saved graphs: poor image quality

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When saving graphs in ResultsViewer to png image format, I have noticed that the ResultsViewer shipped with OpenStudio 1.8.0 produces much poorer quality than in previous release(s). See an example:

Here the legend is missing and the text descriptions are poorly legible. Compare this with a screenshot of the same graph:

Have I perhaps overlooked some (new) user or system settings to avoid this or is this a software glitch ?

My operating system is Windows7 32bit with OpenStudio 1.8.0 + separately installed EnergyPlus 8.3.0 (because bundled EnergyPlus crashes; cf. issue reported. ).