RH crashes whenever I choose AutoCorrect tab in Spelling Options

I'm getting a crash on any RH project (even the samples that came with RH) whenever I choose the AutoCorrect tab in the Spelling Options.

RoboHelp 2015

Windows 7 64-bit

16 GB Ram (Dell Precision T3600)

We use Mercurial for source control.

It must be something unique to my system because my colleagues do not get the same thing.

Ideas on what's causing it? Other tabs and dialogs seems to open fine.