what i do when i replace an image--either by using the same name or a different one is to go into IH2 admin and clear the image cache.
about the additional images...
both IH2 and lightbox share a file...so if you just overwrote it you might have lost the function thru there.
get a copy of the IH2 additional images.php and the one from lightbox and merge them...saving it and uploading it to replace the one on your server.
What I did with mine is put that new file into both the main modules folder and the one inside it with the name of my template.
see if that helps



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