I detected a possible Windows, MacOSX bug in ImageJ when working with OpenJDK 11.01 (tested on Windows 10 and MacOSX 10.12).
On Linux Ubuntu 18.10 the popup menu works fine.
When I try to open the popup menu of the ImageJ toolbar (e.g., right-click on the line selection button)
the menu is not shown. I think this could be a possible OpenJDK bug.
Can someone reproduce this bug, too?
One workaround or implementation is to trigger the popup menu in the mouse released action, see: