HTML5 output is still looking for .swf files in the javascript

All of our HTML5 storyline output has stopped working on our server. My guess is that for safety our server no longer allows .swf files, and in the javascript that Storyline 3 creates for HTML5, there are files still looking for .swf that aren't there.

Lines like this appear in multiple .js files.

:[{"kind":"imagedata","assetId":0,"id":"01","url":"story_content/5YWn3LJKq5u_80_DX1920_DY1920.swf"

What gives? There shouldn't be .swf calls in an HTML5 publish! We have no been able to find a fix for this. When we load an hmtl5 course, it hangs up after the first screen. Everything was working before, but now isn't.