All Comments Disappeared

We’ve been using this plug-in for years and it always works fine. But, starting this morning, it’s not working.

The comments are no longer appearing, instead we are seeing: “Param numposts must be a number greater than or equal to 1” when in Firefox.

Here is our site: [ link redacted, please do not post links in reviews ]

Is there a known issue from the last couple days?

Thanks,
Sara