Just wanted to post this issue and workarounds here:
On October 18 Adobe released the new After Effects CC 2018. Please be aware, we have verified that this release introduces a significant crash related to Mocha's workflow for converting masking data to AE masks.
Specifically, this crash occurs when you are inside the Mocha interface, export Mocha shape data, and copy to the clipboard. When you go back to After Effects, you will most likely crash.
This AE crash can occur in all Mocha products: Mocha AE, Mocha Pro and Mocha VR. Please note, the crash does not occur when pasting tracking data from Mocha to After Effects. Only shape data on the clipboard causes the crash.
For owners of either Mocha Pro or Mocha VR, the simple workaround to avoid crashing After Effects is to avoid "copying mocha mask data" to clipboard. Instead, when using Mocha for masking, use the "Create AE Masks" button in the plug-in interface to convert Mocha shapes to AE masks. All other export formats found in Mocha Pro & Mocha VR are working fine.
Adobe's engineering team has verified this specific crashing issue and has committed to providing a fix in an upcoming point release. Boris FX apologizes for this inconvenience and would like to invite you to download and test a fully working, 15-day trial of the Mocha Pro plug-in for Adobe at BorisFX.com.