To Steverod: I have exactly the same on my setup. It too started happening with 10.11.4 but we can't be 100% sure it's a new issue: some problems are known to happen only on some systems after a SW upgrade (annoying!). We'll investigate. Unplug/replug resolves it for me.
To nanners: that seems a different issue. Make sure the device is recognised in System Profiler, HW->USB section. If not, not much can be done by the drivers!
If recognised, please raise an issue at support.displaylink.com
Kind regards,
Carlo
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