I'm working in Solidworks Simulation 2013.  I've set up a number of simulation data sensors to monitor max stresses and displacements across an assembly.  The sensors behave fine when the study is first run, but if I close and reopen the file, the sensors no longer retain the same data ("data not available").  Updating the sensors does not change anything. The result files are all located in the same folder, and the overall results still display, only the sensor data is lost.  Is there a way to reactivate the sensors without having to run the study again?

Also, is it possible to export simulation data sensors into a .csv?