The following bug was found in Rachel.py version 2.0.6.beta on June 9 2011:
If the user does not choose to re-integrate the calculated yields when re-calculating the simulated yield data, the new data are written to the yield file passed to Gosia, and the output to the terminal is correct, but the simulated experimental yields in memory are not updated.
The short bug report is here:
http://www-user.pas.rochester.edu/~gosia/mediawiki/index.php/Gui_release_notes#Version_2.0.6.beta
A new version will not be issued for several days.