13.6.1 - After Effects error: internal verification failure, sorry! {stuff not in the right sortdir}

I've started getting this error message every time I quit After Effects (I updated to 13.6.1 today and I'm still getting it, I started getting it on the previous update). I have to dismiss several instances of the error message every time.

The projects re-open no problem and everything seems to be fine.

It just happened on a project that has a single comp consisting of a psd as a guide layer, a video layer with Keylight, levels, and hue and saturation effects applied, and a looping background later. No exotic effects or anything.

Anyone else getting this? Any idea what the cause and/or solution is?

iMac (27-inch, Late 2013)

3.5 GHz Intel Core i7

32 GB 1600 MHz DDR3

NVIDIA GeForce GTX 780M 4096 MB

El Capitan 10.11.2

Thanks

-Mike