OmniGraffle crashes when using fn key

Hi everyone,

I’m having a real problem when I use the fn key whilst in OmniGraffle 6.1. The whole programme crashes, taking any unsaved change with it. I’m trying to train myself to not use it, but it used to be the way to Page Up and Down between Canvasses (fn+UP or fn+DN), so I do it pretty regularly. Anyone else getting this issue?

Cheers Duncan