My carefully optimized VP9 (with alpha channel) stingers and graphics stopped working. vMix plays the audio only and the video is blank.

There are some stability issues now as well with a few crashes while trying to get these files to work again.

Since the last time I knew they worked, I've updated vMix, K-Lite Codec Pack (Mega) and the nVidia drivers, so I'm having a tough time pinning down the issue.

Anyone with similar experience, tips or insights?

Thanks,
Eric