I have searched through the documentation of ver. 1.5 and cannot see where/how you change the default themes. I know it should be very simple, but . . .
Thanks
Click on the config button, not the dropdown bit.
http://documentation.coppermine-gallery.net/en/configuration.htm#admin_theme
In addition - http://forum.coppermine-gallery.net/index.php/topic,55415.msg270616.html#msg270616
Thanks.