Bottom border of sgplot graph output is absent

[dal233]

When I run the sgplot procedure to generate four plots on a page, the bottom border of the graph is blank/absent/"white-ed out" in a pdf.  However when I print it out, the border is clearly there. Here is the code for one of the plots:

proc sgplot data= dat.test_sas;

vbar year / response=gwp legendlabel="GWP";

vline year / response=frequency y2axis lineattrs=(color=red) legendlabel="Frequency";

yaxis label="GWP";

y2axis label="Frequency";

run;

[Jay54]

This is an artifact of the PDF scaling on the computer screen.  Often when viewing the doc on screen, the scale factor may be some odd number like 89%, and a thin 1 pixel border may not show through.  The final proof is in the printed page.  I normally verify the presence of a border by viewing at a higher factor, like 200 or 400%.