I'm seeing similar problems related to ScreenSaver + 10.11 ElCap + 2.5b2. After a fresh reboot things work normally for a while but after some time (not sure what the trigger is) the DisplayLink display will stop "sleeping". The other 2 monitors go to sleep but the display connected to the DL just stays on.
Mac Mini 2012
El Cap 10.11.0
3 x ViewSonic VP2365wb monitors: HDMI, Mini-DP, Plugable DL-3500 adapter
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