Bad typesetting, and evince sucks.
I've been reading a lot of papers of late, and any that aren't typeset using TeX are blatantly obvious and hard to read. Even very old papers are much easier to read than some of the modern ones - I wonder how they are being formatted. The microsoft word ones are really obvious - and utterly awful - but there are others which are pretty crap too. The mathematics is the obvious really low-point, but even the typefaces and layouts are pretty rank.
It is however quite a pleasure when I do come across a properly typeset manuscript in the familiar CMR typeface.
I am also utterly fed up with evince. It refuses to remember anything I ask it - from the location I save files to, to the size of the window, and the lack of global close is just annoying. I had a very wide two-page book I just played with at full two-monitor wide size ONE FUCKING TIME a few days ago, and Now every time I open EVERY document, evince opens at the same ginormous size. Fucking ticking me off big-time.
I even tried mupdf - which is just a bit bare-bones for my liking (although it renders much better), and discovered jmupdf along the way who's tiny demo test application is almost as 'featureful' as evince (not that that means much ...), so I might feel another project coming on ... apart from reading them, i'm staring to get a sizeable collection of papers and it's hard to keep track of them based-on-the-title-in-the-filename.