Hi,
Here's a crash report using PixInsight Core 01.08.04.1195 Ripley (x64) on Mac.
ImageCalibration process and select an Output directory which is read only (not writable). Output extension .xisf. When you run the process on a batch of .fit files and it tries to write the first calibration file PI crashes. If you leave the Output extension box empty (assumes .fit) and run the process. It runs with error messages appearing in the Process console but PI doesn't crash.
Regards
John