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;