WindowBlinds and Windows 10 Insider 15025 - READ BEFORE INSTALLING THE FAST BUILD
It appears the latest Windows 10 Insider build may have a bug which could cause Explorer to crash in a loop if a WB skin is applied.
We are investigating but for now we must recommend you disable WindowBlinds before updating your Insider builds and do not enable WB until we have addressed this.
EDIT: This was addressed some time ago and as long as you are on WB 10.57 or above you should be fine.