For testing start OWB from a shell, if there is any "family 'xyz' has no (bold|italic) font" or "font family 'xyz' not found" output your installation is incomplete.

AmigaOS4 fonts

DejaVu Sans Bold Italic BoldItalic
DejaVu Serif Bold Italic BoldItalic
DejaVu Sans Mono Bold Italic BoldItalic

corefonts

Andale Mono
Arial Bold Italic BoldItalic
Arial Black
Comic Sans MS Bold
Courier New Bold Italic BoldItalic
Georgia Bold Italic BoldItalic
Impact
Tahoma
Times New Roman Bold Italic BoldItalic
Trebuchet MS Bold Italic BoldItalic
Verdana Bold Italic BoldItalic
0123456789 (Webdings)