Decided to remove the old G’MIC and just use 2.0. I then tried a few of the artistic presets and Painting, Chalk it up and a few other presets no longer work. Just wondering if you are aware of this, David. 
No, actually Chalk it up works for me.
…as well as Painting …
Have you tried with the latest 2.0.0_pre (from yesterday) ?
This is the error that I get, but just noticed I was using an older version of the 2.0.0 pre-release David. I’ll download the latest and give that one a whirl.
No problems now with the update. Thanks for the reply, David.
As David said, install newest version 2.0.0_pre and refresh.
For me (on windows), this solved the same errors.
edit: lylejk, I didn’t see your last post. Glad it solved your problems too.