Text has disappeared

Has anyone else noticed a problem? Checked my site today, and saw that all the text in the Testimonials has disappeared.

http://www.ckmartialhearts.com/

That is to say, the text is still there, but it is the same colour as the background.

I haven’t changed anything, and tried changing the text colour within teh widget, but it’s still not visible.

Anyone seen the same thing happen?

https://ww.wp.xz.cn/plugins/wp-testimonial-with-widget/