have you checked the correlation between the LR5 printer settings and its pendant in the printer dirver? This might have got messed up / got lost with the update? Or even worse (I had that with earlier version of lLR) my LR printing presets were lost, until I copied them from the previous version of LR to the new ones folder structure; which can happen, if you you are using your own destination for LR instead of the default of LR.
(meant for Windows)
Since I am aware of that I had no printing trouble when switching to LR5.