Remember when we hit this back in July?
https://www.sidefx.com/forum/topic/45087/ [sidefx.com]

Well, it just happened again with build 14942….if you've installed the latest Windows Insider Preview Update, you're going to have a bad day with Houdini. Avoid installing it if you haven't yet.
If you have, roll back your windows if you can.

We're on it.