ANTLRWorks 1.4.1 just doesn't seem to want to debug for me, but v1.4 seems to work just fine. With ANTLR v3.3 just out, is there an earlier set of ANTLR/AW/ST versions that users should consider to be "stable"? Thanks, --Mike Mike Allbright mike at metaorb.com (972) 896-7070