Well that helped heaps .. thank you.
I can now reopen the script GUI and select files. But when I click the Analyze button nothing happens, though the Process Console shows running. I click Abort and nothing, but closing the script window then results in this message appearing in the Process Console:
Processing script file: C:/Program Files/PixInsight/src/scripts/BatchStatistics/BatchStatistics.js
*** Error [000]: C:/Program Files/PixInsight/src/scripts/BatchStatistics/BatchStatistics-GUI.js, line 403: Error: File I/O Error: Invalid or empty file name
26.566 s
What I did was select a single image and specified console output only (no file, no headers).
The Script Parameters shows the outputFile and inputFiles are empty. Is it possible the empty file name error message is because the script parameters shows no file name and when I select one it is not transferred?