[NTG-context] OpenType font problem

A file that compiled properly last November now fails at the very end of processing with the error message [11.11] [12.12] [13.13] systems : end file Seneca_Demarcation at line 219 ){/Users/acbowen/Library/texmf/fonts/enc/dvips/greek/agr-GFSD.enc}{/ Users/acbo wen/Library/texmf/fonts/enc/dvips/gfsdidot/a_gtdpuu.enc} !pdfTeX error: pdftex (file GFSDidot.otf): cannot open OpenType font file for r eading ==> Fatal error occurred, no output PDF file produced! TeXExec | runtime: 63.736925 I have copies of GFSDidot.otf located in ~/Library/texmf/fonts/type1/gfsdidot and ~/Library/texmf/fonts/type1/greek/gfsdidot Any suggestions about how to resolve this will be gratefully received. Alan