When I experienced this, the 3px > 0px blur shifted smoothly from 3 to 1, stayed with a blur of 1 until the last frame then popped to 0. I tried shifting it manually by increments as small as .01px but the blur remained consistent with 1px until it hit the 0 keyframe. The sudden change of blur in high-contrast areas was what made the image seem to pop. (Note that the image was set to shift in transparency at the same time.)
Today I duped the scene and recreated the shift in blur, it is not producing the effect. I went back and recreated it in the original scene and the shift is smooth.
This is after having Hype up and running for most of the day and working on a number of items.
If this had happened with earlier versions of Photoshop (things suddenly not working properly after using the app all day) the official diagnosis would have been a memory leak.
marketing.hype.zip (1.6 MB)