Hello, I installed galaxy-dev using hg clone -r 60448575467f http://bitbucket.org/galaxy/galaxy-central galaxy-dist since http://www.bx.psu.edu/hg/galaxy seems down. I started galaxy, uploaded a fasta file, computed sequence lengths, then sorted on c2. The sort fails with the error: Tool execution generated the following error message: sort: multi-character tab `$\t' I created a tab-delimited test file with 2 column, one letter in the first, one digit in the second, then sorted on c1: got the same error. The sorter.py is doing a system call to the unix sort function (I have sort (GNU coreutils) 7.4). I tested my shell by running this on the command line /usr/bin/sort -f -t $'\t' test-file and it worked. I modified sorter.py to use /usr/bin/sort, restarted galaxy... and still get the same error. So there is something wrong in the way the shell escapes the $'\t' in the sorter.py line: os.system(cmd) Any help greatly appreciated. Isabelle