Errors in the input NCL file may lead to feedback loops in action propagation and, consequently, to endless reactions. If this happens and if the program has only one thread, which is usually the case, the program will enter an infinite loop.

Libginga handles audio output internally by itself. One cannot use the external API to get the audio samples corresponding to the current Document state.

Member ParserState::pushImportBase (ParserState *, ParserElt *)

Check for circular imports.