You ninja'd again before I could report the same; chunks disappeared(1.8.9). Is there a way to recover the chunks that had been loaded in b1.4 and disappeared in b1.5? I had backed up a copy of XaeroWorldmap folder but it seems as if the format might be different... No problem if they can't be recovered, as I can just explore again and I've already installed b1.6.
Xaero actually came to the server I hang out, checked the unique/odd issue I was having and FIXED it promptly! This guy's a genius and a hard worker. So impressive <3 <3 <3