Omni 7 install has caused Fontawesome issues!

I installed Omnigraffle 7 on Tuesday this week, I went and opened some files created by a colleague who has left the company recently and see that all his workflows using Font awesome have little question marks indicating the font is missing.

There are HUNDREDS of screens!

How can I fix this? I installed the latest Fontawesome (4.7) which hasn’t made a difference.

I do not want to have to go through every single screen and replace the question marks - that will take most of a day.

***Just to extend on this - Omni has not only converted the Fontawesome to black questions marks everywhere but also reads the font as ‘.LastResort’ ***

Please help.