Hey (I really hope its the right place for this post) Lately i've been using the 'Export Map' a lot, to create jpeg images and PDF's for my boss who doesn't use arcmap. In one of the times I accidently pressed on this tiny arrow that minimizes your export type options (pdf,jpg, etc.) and even the resolution changing option is gone. All I can do now, is export a jpeg file without the abillity to change the resolution. I have windows 8 on my laptop, maybe its a part of the problem.