Update to the GUI post below
So when I put together everything for the Creating a GUI using GTK3 and gtk-fortran post about a month ago, I completely screwed up the test.glade and apparently included an older version that didn’t have everything named properly. In any case, I’ve fixed the issue, tested it (I should have done this more thoroughly the first time!), and everything should be working okay.
Here’s the location of the new project template with the fixed .glade file: