Check why name GF is suddenly blocked in preprocessor
The mod-file
////////////////////////////////////////////////////////////////////////////////////
////// Deregulation at the Cost of Shadow Work /////////////////////////////////////
////// Deterministic simulation file with estimated parameters, South Africa ///////
////// R. Anand, P. Khera, Z. Munkacsi, M. Saxegaard ///////////////////////////////
////// IMF, Jan 2015 ///////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
For some reason, it thinks GF is a reserved name/token. It works in 4.4.3.