Testing for fontfamily error

Last night, one of our moderators tried to enter a summary of the night's activity including a couple of URL's to posts and it generated the same error. The post was as follows:

Quiet night, logged on to only 4 posts, and then a several throughout the night. Spent half the night replying to some longish posts. 

There's two to keep an eye out for. We've had moderators respond at the point, but there's not been much discussion, so some prompts, community building activities, and encouragement might be helpful:

Just testing to see what the url is on the reply post page.