After upgrading my Surface Book from the prior insider build to 14926 it is now unusable.
Explorer.exe is crashing every few seconds. In event viewer I found this was logged:
"Explorer crashing Faulting module path: C:\WINDOWS\System32\pnidui.dll"
Ironically if I dock the machine and run only on an external monitor explorer quits crashing and I can use it. At this point I will have to only use it in docked mode and wait for an update.
== Update 9/27/16 ==
If you have a machine running an older build of windows 10 (I have anniversary update on another machine) you can copy 2 files to fix this problem:
I copied these files to a temporary directory on my machine and then booted into a safe mode command prompt to replace them. After rebooted everything seems fine.