Perforce diff not working for blueprint defaults?

When I click Diff Blueprint Defaults all I get is the attached error dialog

3303-p4differror.png

Hi,

It looks as if there is an issue supplying filenames to the diff tool when there are spaces in your file paths.

I will get the issue added to our backlog. For now the only workaround is to move your project into a folder that does not have spaces in its path.