A simpler fix would be to > su - # ln -s /usr/lib/Tix8.4/libTix8.4.so /usr/lib/libTix8.4.so # exit As Tix8.4 isn't in the default library path for whatever reason. This adds a dynamic link to the required library from the default path. My apologies to those who tried a fresh Python source install. -- -------------------------------------------------- Dan O'Donovan CCPN PhD Dept. of Biochemistry, University of Cambridge Tel: +44 1223 766022