Greetings Richard,
We've encountered a small issue in showing and hiding differences involving a newline character.
An example of what the student saw is below. They have an extra System.out.println() in their code. On first viewing the results you can see there is an extra line in their output. Pressing Show Differences does not highlight this (I am not sure how it could), then on pressing Hide Differences that newline is stripped out, and it looks like the student's results are correct, as illustrated.
Since the question involves stripping out spaces we can't just use near exact match. (I wonder if it is an OU thing!)
Regards,
Anton