Hello,
I do not understand your solution, because I have 340 posts in my blog (http://mosaiquedimages.wordpress.com/) and they are all configured the same way, i.e. that each post contains only a picture without text. In the example you give there is text in addition to the picture and, in this case, the problem does not occur (I tested that).
Can you correct the problem when each post contains only a picture without text.
Thank you.
Sylvie