Good spot Peter - I use Linux so can't use the Canon s/w - hence using web interface instead. So both are options. Now - did this setting help with Cassiop38's problem? - am curious to hear.
*EDIT* I just noticed that Turboprint does indeed provide this same functionality - so no need for the...
Perhaps slightly off-topic, but if ever you do feel inclined to port this to Windows, try passing the whole palava to Anthropic Claude and ask him very nicely to do it for you. I used to use a homebrew bash script for profiling - not so different from yours - but recently had Claude convert it...