did that happen on an installed windows that was already reduced? if yes it could be a font you removed and which caused this.
i will have a look into this since im testing and removing every component winreducer offers. i will post an update when im through
this report is old, does this problem still happen?
If there is no new info, or no other gut this problem, i will close this bug report on the end of the week.
EDIT: i tested it and didnt see this happening