for this code:
plot(arange(5),arange(5), 'y.', ms=30.0, mew=0, mec='r')
The pdf and ps show a marker edge even though the gtkagg window doesn't (neither do the png or svg savefigures).
The marker edge in the ps is black instead of red.
I haven't done a git-bisect, but
f1388ee3c3a5c72af00701e5a623545f0df2f426 from April 11 seems to have the pdf problem but the ps doesn't have a marker edge.