Hello Jean Pierre,
After you save the file, I think the edit path loss dialog is still active and probably behind the spike window. This is preventing you from interfacing the Spike dialog.
You can bring those to the front by finding them in the Windows toolbar along the bottom of the screen. The windows should be grouped with the Spike application.
I apologize for the inconvenience. I will see if we can keep these on the top automatically in the next release.
Regards,
Andrew