Signals Image Artist: Where is the Image Import app log file stored?

Paste the following path...
 
%LocalAppData%\Signals
 
...into the Search bar of the Windows client where the Spotfire Analyst is installed...
 

 
...then hit enter. 
 
It should open the folder which contains the ColumbusNavigator.log file.

See also: Signals Image Artist: Where can I find the Columbus Navigator log file?