Two of my fonts were working Thursday, then Friday they just stopped. I changed nothing.

I have a test page with two Hebrew fonts, Noto Sans Hebrew Condensed and Semi-Condensed, along with Trade Gothic Condensed for English. I invoke the Hebrew with classes (.h1heb, .pheb, etc) and as I said, it worked beautifully on Thursday. Then on Friday they simply refused to load, and have been invisible ever since. Has anyone had this happen, and is there a way to remedy it?