I'm pretty sure what happened is when I did an apt upgrade on testing, the libgtk-4 binary packages are held back for some reason, but the - common package was upgraded to 4.14.4 which changed the schema which then broke dino-im.
ii libgtk-4-1:amd64 4.12.5+ds-6+b1 amd64 ii libgtk-4-bin 4.12.5+ds-6+b1 amd64 ii libgtk-4-common 4.14.4+ds-8 all ii libgtk-4-media-gstreamer 4.12.5+ds-6+b1 amd64 I downgraded back to libgtk-4-common=4.12.5+ds-6 and dino started again. I suspect libgtk-4-1 should have a stricter dependency. I'm going to retitle this and assign it to gtk4 Diane