Mark,

I cloned the repository, and built the code, but on execution I got:

Running ./DebFind 
failed to load config: will use defaults

(DebFind:95981): GdkPixbuf-WARNING **: 12:10:29.070: Inline XPM data is broken: Dimensions do not match data
glib.ConstructionException.ConstructionException@../../../../../.dub/packages/gtk-d-3.9.0/gtk-d/generated/gtkd/glib/ConstructionException.d(37): null returned by new_from_xpm_data
----------------
Pixbuf.d:679 [0x55d5002f49b3]
appwindow.d:60 [0x55d500290569]
app.d:16 [0x55d5002e0e78]
DClosure.d:122 [0x55d5004ccff3]
??:? g_closure_invoke [0x7f472bfb4fd1]
??:? [0x7f472bfc8783]
??:? g_signal_emit_valist [0x7f472bfd354e]
??:? g_signal_emit [0x7f472bfd3ede]
??:? [0x7f472bc9fe17]
??:? g_application_run [0x7f472bc9ffc9]
Application.d:931 [0x55d5002f8f34]
app.d:18 [0x55d5002e0dbf]
??:? void rt.dmain2._d_run_main2(char[][], ulong, extern (C) int function(char[][])*).runAll() [0x7f47386b0e7f]
??:? _d_run_main2 [0x7f47386b0c8e]
??:? _d_run_main [0x7f47386b0aed]
entrypoint.d:35 [0x55d5002e0ea4]
??:? __libc_start_main [0x7f47382c2e0a]
??:? [0x55d500253c29]
Program exited with code 1

which I suspect is nothing at all to do with the problem you were hoping we would take a look at.