It's the browser version, I'm using Google Chrome and I admittedly don't know what "clearing your Chache" is-
Click the three dot menu icon in the upper right corner, select "More Tools" > "Clear Browsing Data". Select "Cookies and Other Site Data" and "Cached Images and Files," then click "Clear Data." If that doesn't fix it, I'm not sure I can do much since this since this is the first and only time I've ever seen this error and I haven't been able to replicate it, I'm sorry :( If you don't mind replaying to that point, I would recommend playing the downloaded version.