1
Your description of the problem does indicate a problem with the graphics drivers, did Blender and DaVinci resolve previously work correct on your integrated AMD graphics?
2
The best option is to completely remove the current AMD graphics driver using the widely available free DDU utility, then restart your PC and go to the AMD website to download and install a couple of slightly older versions of the AMD graphics driver to try to find a version that is stable on your system.
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