Note: 438652.1 - R12: Forms Runtime Diagnostics (FRD), Tracing And Logging For Forms In Oracle Applications Note: 445166.1 - How to create a FRD (Forms Runtime Diagnostic) Log in EBusiness Suite R12 using Forms 10g
Make sure you bounce the services once you enable/disable FRD.
I have already see these notes but as i told you . the profile options (ICX: Forms Launcher , Forms Runtime Parameters) has default.
the appsweb.cfg) file under the (FORMS_WEB_CONFIG_FILE) is never changed.