FSElite is looking out for you! The title says it all: do not take part in Windows 10 Insider Program if you do not want to mess up your simulator.
ERROR CREATING CHILD WINDOW
This is the dreaded message you will see if you decide to update your Windows with the Insider Program. Let me explain why this happens and why this totally kills your simulator. Microsoft and Windows are currently making changes to their OneCore utility. If you don’t know what OneCore is, I at least know enough to tell you that it is absolutely an integral part of all high-class add-ons out there: PMDG, GSX and so on. Developers use it along Prepar3d to enable pop-up windows to interact with your simulator. With the changes Microsoft are making to OneCore, it is no longer compatible with said add-ons. Therefore, on start-up, you will get the same error and every time you will want to open GSX, pop-up your PMDG FMC and execute many different actions, you will get the ERROR CREATING CHILD WINDOW error, and will be left hanging with useless expensive add-ons.
Problems have been reported with builds 16176 & 16179. Build 16170 seems to be working fine. Make sure to not go over this build for the moment if you are currently an Insider.
I do hope you read this before deciding to enroll in the Insider Program. While some of the features are quite neat and interesting, it is not worth destroying your simulator with it. The even more scary part is that if you enroll in the program, it is very hard to stop the updates from coming in and you might even need to re-install Windows, something I had to personally do. Best case scenario is that you will need to roll back to the previous version of Insider (which in your case would mean a version still not compatible with your simulator add-ons), but if you wait too long, this version will be expired and you will be left hanging until the next stable release of Windows 10.
Again, spare yourself the nightmare of having to re-install everything and do not take part in the Insider and Creator program. If you are already in it, make sure to disable all further updates until the next stable Windows release. This is the best advice I can give you.
This is my bit for today, I hope this will avoid some of you guys the pain I had to go through, but as they say: you live to learn.
The Windows Insider Program is something you decide to join deliberately. The computer will not automatically update your Windows 10 with the Insider updates. If you are not enrolled in the program, you have nothing to worry about.