Though I agree with many posters that MS, a company known for purchasing other software companies, forcefully integrating their solutions into their OS then claiming you cannot not have it and still run their OS, has clearly failed their community of users in regards to SIB. There 'nuf said.
As for the solution, please reference:
AOMEI Backupper (free for now) is a viable and stable replacement for Windows 10 1709 systems. I am a hardware production tech that creates a base image and then needs to redeploy that image to hundreds of client machines. When SIB failed in 1709 I needed to find a solution quickly and AOMEI, thus far, has satisfied all my needs. Also, I am no longer restricted by drive size. I can create a base image on a 1TB HDD and restore it to a 128GB SSD (as long as the overall data is smaller that the destination drive). It has a very easy to use GUI and you can do a full disk backup and restore from a local USB HDD or network location. It is everything SIB should have been.
If you have created a vhdx using SIB and do not have a stable system to create a new BU using AOMEI, sorry this will not help you, but going fwd this is the best solution I have found.
I DO NOT represent AOMEI in anyway - I am just a tech that needed a solution like the rest of you and this has been a very good solution for me over the two months. There may be other 3rd party solutions out there that do a good job as well, but I cannot argue with stable and free.
YMMV
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Remembering all the Daleks this 21st day of Dec 2017 -EXTERMINATE!!!!