Images no longer appear in Edit screen

Images no longer appear in Edit screen

Greetings,

I have been using ZoHo for about 6 months and have been getting quietly confident however for no apparent reason my images (this week) no longer appear in the Edit screen of any of my templates but they do appear in the test email when it is sent.

Have cleared browser cache, confirmed the images are in the Library - where to from here?

Roger