One of my colleagues reported the following:
As a result no progress is visible.
The installation happens without any issue but the actual window is completely transparent.
I tried to grab a screenshot but not even that is possible.
The shadow around the window doesn’t register at all.”
The exact same installer works fine in Catalina and older versions of macOS, and we’ve never experienced this kind of display issue.
This begs the question: when will InstallBuilder add support for Big Sur?