Thank you for your post.
Our Development and Testing departments are already aware of this issue with Web Viewers under Windows. As mentioned in another forum post, FileMaker uses the webkit interface to handle information in a WebViewer. Under Windows, that is based upon Internet Explorer. FileMaker captures the WebViewer content as metafile format, but the image conversion under Windows cannot handle sharp image output (except JPG/PNG/etc.), so date:text will appear bitmapped/blurred.
I have attached your post to the original report. When more information becomes available, I will post again.