Found it. Geany 2.0 comes with broken color scheme templates. Look at the brace_good line, whoever made those bundled schemes typed a comma instead of a semicolon!
When I fix the broken scheme, it now works properly. If the Geany programmer sees this, the default line should be reading:
brace_good=pro_orange,pro_selection_background;true;false
Perhaps fix this in v2.0.1 ... in all the bundled color schemes! ;-)