Hello,
We've not have a reproduction of that particular issue.
However, we have addressed a similar area one in the following 8.4 M2 development build.
http://www.displaylink.com/downloads/file?d=153
Would you be able to try and check if this changes the behaviour you are experiencing?
This way, we can know if we're looking in the right direction and the issue you're seeing is addressed by the other items we've fixed.
Kind regards,
Alban