We've still not managed to reproduce this freeze on our HP laptops in our system test lab.
I have just released our v6.0 software on the forum, which not only contains support for our new chips, but also has bug fixes and some rearchitecture. This may indirectly fix the lockups you are seeing.
I'd appreciate it if you could try this software build and see if the freezing issue "goes away"
http://www.displaylink.org/forum/showthread.php?t=1076
If it still occurs in this, then we'll look into making a special build to try and give more information on the freeze.
Thanks
Wim