This question has been answered by BobRay. See the first response.
When you have time, you should definitely consider switching to Collections. It's actively developed. If and when you switch to Collections, you'll need to make some changes to the Article container and its children. This post should have all you need: https://forums.modx.com/thread/?thread=99571&page=2
FWIW, I'm using Articles 1.7.11-pl with MODX Version 2.4.4 with no trouble.
One user solved it by reinstalling Quip.