PNG Disappearing in Preview

[johnecpp]

Re-designed a logo in PS4 and saved as a png - as usual. I did a drag-drop into WD6 and it appears on all the web pages; but when I do a preview it is not visible on any page. I checked the 'arrange' to be sure it is in the front. I even moved it to the middle of a page and it is still not visible. The png title is long; but I don't think that would affect visibility.


Any suggestions as to what I missed?

Thanks,
John