I am programming with Mathematica 10.3.1.0 on Windows 10 Professional 64 Bit and have an i7-4940-MX 3,1 GHz processor (4 cores).

When I use in the example code below `Table` the exported png files show axis numbers and labels, as expected.

**With `ParallelTable` the axis numbers are randomly missing** in the exported files, while when the plots are showed in the notebook they are ok.

On an MacBook Pro i5 (2 cores) the exported files are correct.

What could be the problem? 

Here are my exported plots, for `Table`: https://goo.gl/GDevo4 and for `ParallelTable`: https://goo.gl/gBoLk8 produced with the code below.

    ChoiceDialog[{FileNameSetter[Dynamic[outputDir], "Directory"], Dynamic[outputDir]}];
    SetDirectory[outputDir];
    
    image = ColorConvert[ExampleData[{"TestImage", "Lena"}], "Grayscale"];
    levels = ImageLevels[image, "Byte"];

    Table[
      strCounter = ToString@PaddedForm[i, 2, NumberPadding -> {"0", ""}];
      hist = Histogram[WeightedData @@ Transpose[levels], 
        256, {"Log", "Count"}, Frame -> True, 
        FrameLabel -> {{"# of Pixels", ""}, {"Brightness [0,255]", 
           strCounter}}, PlotRange -> {All, {0, 2^16}}, 
        BaseStyle -> {FontWeight -> "Bold", FontSize -> 40, 
          FontFamily -> "Calibri"}, ImageSize -> 2000];
      
      fileName = 
       StringJoin[outputDir, "\\histogram_table_", strCounter, ".png"];
      Export[fileName, hist, "PNG"],
      {i, 1, 10}
      ];
    
    ParallelTable[
      strCounter = ToString@PaddedForm[i, 2, NumberPadding -> {"0", ""}];
      hist = Histogram[WeightedData @@ Transpose[levels], 
        256, {"Log", "Count"}, Frame -> True, 
        FrameLabel -> {{"# of Pixels", ""}, {"Brightness [0,255]", 
           strCounter}}, PlotRange -> {All, {0, 2^16}}, 
        BaseStyle -> {FontWeight -> "Bold", FontSize -> 40, 
          FontFamily -> "Calibri"}, ImageSize -> 2000];
      
      fileName = 
       StringJoin[outputDir, "\\histogram_parallel_table_", strCounter, 
        ".png"];
      Export[fileName, hist, "PNG"],
      {i, 1, 10}
      ];