There is an issue when running programs compiled with g++ on the GRACE machines. The solution is to compile as follows: g++ yourprogram.cc -o yourprogram -Wl,-rpath,/usr/local/lib
For Python, you should be using /usr/local/bin/python. We temporarily installed a copy of Python in /afs/glue.umd.edu/class/fall2005/cmsc/723/0101/public/python/bin/python. (In order to run it, you must first do 'setenv LD_LIBRARY_PATH /usr/local/lib'.) But this will be going away at some point.