The ComboBoxText widget no longer seems to work for me under Julia 1.8.5. It works fine under 1.8.4. Try the example in the Gtk.jl documentation under "ComboBox". It aborts immediately.
In a program I wrote that uses the ComboBoxText widget, I get a segmentation fault as soon as I try to use the widget to select an item when using Julia 1.8.5, but the program works fine with Julia 1.8.4. I'm using Gtk.jl v1.3.0 on an iMac with Mac OS 12.6.3, both of which are current. Any ideas or suggestions?