Office 2016 on my OS X 10.10.4 2012 27" iMac is displaying fonts poorly. The fonts in excel and word now look jagged and are roughly rendered. Some documents and fonts look better than others, but arial looks particularly bad. Also, older files appear worse than new files, which is a big problem since i use a number of forms in my business. Any thoughts on what's going on here and how to fix it?