Originally Posted by Si

Theme forest, it's a paid theme. the name is "collection"

I've re-installed it from scratch and just tried another theme and it seems that is still coming up so maybe it's not the theme.

I think it may be an image I uploaded causing the problem because the theme I tried previously that stopped the malware warning didn't display the thumbnail images, this new one I'm trying does and the warning is still coming up.

Now I've just got to find which image is causing the problem