Hi SamK
1. My fault. libgmtk was compiled with dconf storage which tinycore lacks.
2. Yes, I do not usually include gnome-icon-theme as dependence because of size (>8M). I should have warned in info file.
3. Yes, this is related to 1.
I have recompiled libgmtk to avoid dconf storage, now it saves configuration under .config folder. I will send it.
Thanks for testing and apologies for inconveniences.