Reverting to 6.3 works so far
I went so far as to uninstall the driver (Graphics and Core components) and restart. Windows prompted me to install drivers for the new hardware, and it found version 6.3 of the DisplayLink Core driver.
Since I've been running that (approximately Thursday afternoon), I haven't had any issues (crosses fingers!).
Not a great solution, but at least for me it's working.
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