I updated to 1803 and had to go back to 1709 immediately. (I had some time between projects, so I took the chance)
On the 1803 build, I had the usual clip and audio dropouts that had been going on periodically since windows 10 / cubase 8.
Cubase did open up fine, and even closing a session or the program went well (on 1709 i have to always end task from task manager). But performance of VST/CPU was very poor.
To be fair, windows build 1709 gave me the same trouble in the beginning. And rollback is very smooth, if you stay within the 30 days.
Since my system is running fine in current config, I’ll leave it as is for the time being.