Just tried to generate JRUG PUNK font and some warnings came up.
"feature block seen before any language system statement. you should place any languagesystem statements before any feature definition" followed by "C:/Documents and settings/My documents/fontlab etc." in brackets.
And then "feature 'frac' referenced in aalt feature, either is not defined or had no rules which could be included in the aalt feature".
Both warnings are Greek to me. I assume I need to fix something, but don't have any idea of what or how.