Revived. Created personal extension, loaded, wanted to modify. So re-created the extension with same name *.sce. Attempted to load, output indicates extension already loaded. Used to this, basically need to reboot then re-load extension. BUT sce-load provides the -f option, which apparently means 'overwrite existing file system tree files'. So obviously i don't fully understand what this means, as attempting to re-load an already loaded extension using the -f option resulted in the same 'already loaded!' output. Enlightenment appreciated, thanks.