Graphs does not appear

PROBLEM: Instead of graphs we see only word 'Graphs'

TROUBLESHOOTING:

• Check GUI log just after Graphs fails to show
  • We can see:

LoadError (Expected /home/mor/lib/gruff.rb to define Gruff):

NOTE: In future versions (0.6 and so on) RMagic based Graphs will be changed to Flash based graphs.