halion sonic 3 not being loaded in Cubase Artist 6.5

Hi, my halion sonic 3 is not working as a VST plugin. It works fine in stand alone but Cubase is not recognizing it. I checked the plugin folder and the file is there as I think it should be. It’s a mac 10.8.5 by the way. I tried reinstalling it but nothing has changed. I downloaded Reaper to check whether the problem could be compatibility with cubase artist 6.5 but Reaper only recognized the AU version and it didn’t work anyway (the GUI didn’t show nor any sound came out as I played the midi keyboard).

Thank you for any support you could give as I couldn’t find any hint in the steinberg home page support.