It only happens ocasionally, start form appears collapsed. See screenshot.
Created attachment 811114 [details] Collapsed form and Firebug insight
Changed the resize method, now it's going to be executed only when document is fully loaded. Commits (master): https://github.com/droolsjbpm/jbpm-form-modeler/commit/5a555b46039d978c37b034860d3b0bff865556bd Commits (6.0.x): https://github.com/droolsjbpm/jbpm-form-modeler/commit/3bf9c49f823ec24a55b533fb610047256062edec
Verified on BPMS 6.0.0.ER7