HTML5 Error Framemaker - again ?

Hi there, i'm back again... 

So after much trepidation, I managed to get all of my framemaker outputs working smoothly and was very happy. 

This was all done in a test sub folder, structured:

B:/ Production Documents > Frame_Maker_Demo > Doc Name  (This level holds FM Files, Images and output folders) > HTML5 Output 

Outputs worked great and I was happy with it so I've made some folder structures in live folders to start authoring into... for example

B:/ Production Documents > Dpt Name > Doc Type > Doc Name (Same as above) > HTML5 Output

I recreated the document I had been testing from scratch, referencing images in the new folder directly and recreating topics as my initial Copy-Pasta effort didn't work.

When outputting to HTML5 to the new output location, I immediately got the following HTML5 error on each TOC topic reading ":( it may have been moved, edited or deleted)" see attachement.

Initially I had issues with the images not loading but the body text was still there, now, it can't find ANYTHING... 

I am utterly confused, as the only difference from testing is the end location and the bulk of files are one additional layer deep. 

My two thoughts are this: Either this is an error caused by referenced images (which was the previous issue) OR this is somehow caused by the folder structure, that's the only thing that's changed.