Thanks for the help, Mircea!
I have updated WPCode to 2.0.1 and that’s made no difference.
I imported the snippet from Code Snippets with the import tool – but while it reported success, the snippet didn’t appear in WPCode. Importing it as a JSON file worked, but trying to activate the snippet got the error above. The same with copy/pasting the code.
Okay, I’ve found where I went wrong. I’d unloaded the stylesheet for the site, re-enabling fixed it aside from the image still being distorted.
