first , uncheck all the folders that you watch for music. second, download the emelfm2 filemanager and install it. go into xterm and becomeroot then simply type ... emelfm2. this will open up the program with root privileges. make sure you have the big "H" in the upper right hand corner clicked so you can see hidden files. then navigate to /home/user/.canola
and delete the canola.db file. close the filemanage and xterm then restart canola and recheck all the folders you want watched and this should take care of the problem.