<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />sgarb asks if the issue of closing multiple multiple windows is fixed.
This was reported in Tech Support tracks 7611253334, 7611236044, 7611247870, 7611284662, 7611491457, 7611492519.
We tracked it internally in Defect S1074256, described thusly:
Window > Close All does not close all windows if at least one file is not saved and you tell JMP to "Save None".
It is corrected in JMP 12.0.