As mentioned previously, there is an issue when plotting FDO hatches in a rotated viewport.
It seems to occur with different hatch patterns (except solid) and with different plot devices (DWG to PDF, HP DesignJet, DWF). Here is an example - in some areas the hatch is missing:
As we found out, not all plot devices seem to have the problem. We are able to plot our layouts without this particular issue using Adobe PDF writer.
Map 2013, SP2