I don't think I am using the BDK Beach Development Kit. I do not see a file in my plugins with that info. I do have PEG Super Resource Pack and Super Textures Pack. Is the BDK included in that??
The stadium if demo'd and replopped appears fine. But when exiting and reloading it appears the same, only partially there. Large Parks appear as blank green spaces, a few buildings are missing from the University as well. Again, none of these issues are happening in other cities.
I opened the city, let it play for "1 month" and resaved and the file was larger once resaved. This is the largest city in the region with a file size of 27,212KB (if that matters).