I didn't try reinstalling v7.9 b1, because getting Windows to re-scan for drivers resolved the issue.
The driver Windows identified for the Plugable Ethernet adapter (on the UD-3900 dock) is 7.7.60003.0, based on Windows using dlcdcncm62.sys (it's located in C:\WINDOWS\system32\DRIVERS; file version is 2.34.11.0).
All the other Plugable adapters I have are currently using DisplayLink driver 7.9.95.0.
Still no major issues for me (e.g., screens blanking), although there is some occasional lag when scrolling with a mouse.
I may try a clean install when the next Windows 10 beta drops, rather than an in-place upgrade, to see if that makes a big difference. Certainly planning on taking that approach once the final version appears in late July/early August.
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