BUG: LAVFilters Video Decoder Glitches with Sage

Using latest v9 Installer (9.0.4.232) on Win10 (64 and 32-bit systems) with LAVFilters (0.68.0). These are low-power clients, Nvidia ION Nettops. I've done fresh installs, and with VMR9 or EVR using LAVFilters, DXVA2 (native or copy-back) I get problems like in the attached screenshot: where there is a big scene-change, large parts of the screen get blocky with only moving objects refreshing and clearing.

This doesn't happen with Microsoft DTV-DVD decoder, but that seems to be more software and these limited systems can't keep up.

If I use LAV Filters in Kodi or MPC-HC with the same settings and video, no problem, so I figure it's a problem with the way Sage is using the decoder.

Only HD video shows the issue btw. I've been trying to fix this for weeks, but can only solve it for clients with enough power to use the MS decoder.