Apparently, the whole '3d' directory is missing in V5 SP4, so maybe there's nothing wrong with the curve_gen script? The error should occur any time r3subdiv.js is loaded.
OK, I'll reply to myself: it's even more serious, many other include files need this missing directory... for example, the L-system script doesn't work any more because r3nurbs.js has the same problem. Is something wrong with my setup? Does anybody have this map lying around somewhere?
-Mark H
