Filling up "most recent" block
This is, as I understand it, the way it works at det moment:
PPC fetch the last x+10 ads. (Where x is the value of Number of products to display in the most recent additions section) and place those with image(s) in the "Last ads" block.
It's done this way to save resouces.
The result is that the block might be empty if the last x+10 ads does not contain images. (either because the user hasn't provided images on a Sale ad or that they are "Buy" ads.)
And users wonders why their ad is not displayed.....
Suggestion: Keep a record of the last ads with images that's updated every time a Sale ad is added/deleted.
This should reduce load and secure that "most recent" block is always filled up.