Last year I was getting the same result
My Browser is Fire Fox
Images full of raster.
Then after much fiddling and question asking - here and elsewhere I concluded that increments to FireFox had somehow made Cool Iris incompatible and I gave up on it.
Even BBC News if relocating a news item picked up from CoolIris- it want awry whilst the main screen stayed OK.
Then you raised your query- so I clicked your link.
And presto it Worked
So thank you for that.
Suggest you make sure you are on the latest Browsers
-are you FireFox?
and reinstall- Cooliris.