Hi Arthur-if no autocomplete is working at all, check OPtions > Appearance page > Autocomplete commands. If some are working (from Rhino itself) and plug-in commands not, that suggests the plug-ins are not loading. Note that there are a number of commands that appear to be Rhino commands but which in fact are in plug-ins, so if only some commands do not autocomplete (do they work at all if you type the entire command?) please tell me what some of them are, I'll try to sort out which plug-in is involved.