hi Vincent,
the stupid thing was:1. even when i uninstalled the plugin the toolbar was still visiblie in rhino ...2. when i tried to install the new plugin it was not functioning , unknown command! So i tried to find out if it is by the rhino plugins, wasn`t there, so i started to look where can i find rhp. or rui. format on the PC OS, so I find it somewhere and loaded it manually ... and it started working .... but this shouldn`t be the way to install plugin , it was a big big struggle. till solved ...