W10 10240 DWM & Dell Hub
 

Hi,
I am using the Enterprise edition of 10.0.10240.16384. What I found is - like a cable unplug - situation (all disconnected, starts to reconnect again). In the even logs I found the DWM.exe (dwmcore.dll) and the Dell Gigabit (dlcdcncm - most likely this is just a follow up symptom) crashing when working on multiple (3) monitors.
I cannot run any tools right now to provide more insights, but I wanted to share my experience so far as it might help you to do final tunings on 7.9RC.
(and yes, I am using the latest version).

All the best
W