But all jokes aside: MS environments are often not tested, as most developers and heavy users that do beta test do not run LS in an Windows environment. So especially at the beginning of the lifecycle of a new branch (LS 4.x is fairly new) we always see hickups in MS environments.
I would suggest to create a bug report with as much detail as possible, so that the developers can try to fix this.
Help us to help you!
Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.