Errors retrieving frames in v14.4.0
I just updated to Premiere Pro version 14.4.0, build 38, and I'm suddenly having issues with the "Error retrieving frame..." and "Frame substitution recursion attempt aborting..." errors. Though the error report lists problems with other sections (see attached picture) the real issue seems to be limited to the first few frames in several of my clips. Just yesterday they worked perfectly, but as of this PP update, these frames are just black. The clips in question are significantly manipulated (slow motion, scale and position altered, etc.). They are all from the same MPEG file, which is 23.976 fps at 1080p. This is a video file I originally exported from another sequence. This source file plays perfectly in VLC, so I don't think it's suddenly become corrupted.
I see now that when I pull this clip into the source monitor, the whole clip is black. This is in spite of the fact that most of those frames are visible in the actual sequence. I attempted to use the "Replace Footage" feature to re-link to the original media, but this isn't helping.
I've also attempted rolling back to my previous NVIDIA graphics card driver, since some of those drivers have caused issues in the past. That didn't work. So I installed the most recent graphics card driver, but the same issue remains.
Has anyone else been experiencing similar problems since this update?
[Specs:
Premiere Pro version 14.4.0, build 38
HP x360 Spectre convertible 15 inch laptop from 2019
Intel i7-10510U (4 cores), 10th gen
16 GB RAM
NVIDIA GeForce MX250 as well as Intel UHD Graphics]
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