Hi, I just change Yhc.Core in an imcompatible way, and upgraded to version 2 of the files. The new difference is that Functions and Variables are treated differently, which makes some things easier for the users of Core. Any existing .ycr files will fail to load, so delete them, rebuild them and then use them. I also added a -viewcore argument to Yhc today, yhc -viewcore File.ycr will now show you the file. Woohoo! Thanks Neil