There Getting this message when using Smush It - Oh Snap!

Hi There

Getting this message when using Smush It - Oh Snap! Seems like Smush Pro server is not reachable, you can try back in some time.

If I do manage to get Smush It to connect and it processes the images, what happens if it cant connect to the server? Will the images not show on the site? Will it fall back to the original, un-Smushed images?

Just nervous as I'm trying this on a client site and I don't want there website to break.

If you could let me know that would be great.

Thanks

Mark.