Installed fine... reboot fine... then locked up (no BSOD just completely unresponsive). Hard reboot and it appears to be working fine.
No improvement on dock... still can't use two Mini DP to DP monitors (only one at a time). Still having USB issues.
SB i7/16/512
Yes, I know the Dock has given me a lot of trouble with my external monitors and now more frequently with my fingerprint reader after sleep. However, I have never completely lost one or both DP monitors (like you, they are mini to standard) permanently. At most, I have spent several hours in total to get things back completely to my settings (resolution, text size, etc.).
I always start with the basics: Undock, re-dock, power off/on monitors, disconnect/reconnect monitors, and even unplug the dock itself! Sometimes, of course, it takes several combinations/permutations of these techniques to finally get things going as they were again.
But when the above still doesn't work, I go down the path of disconnecting all monitors, then even switching the ports they are connected to, or trying to connect them directly to the SB, and also doing a hard reset. Again, sometimes it takes several combinations/permutations, but eventually I am successful.
Hope this helps to give you some ideas that you haven't tried yet because I know how frustrating it is not to have your external monitors usable.