Got the Anthology, had already played DD some years ago so left that aside, at first dived into D2 since that's what I wanted mainly but then said might as well try BD first (though I didn't mean to before, from what I knew about it), and now I noticed this...
On top of map not reloading when I load a save (at least as of some point, in the act 1 battleground), have to go back to an area for it to remember I had explored it, there seems to be something weird with the save files which I just discovered now: If I put the BD saves on an USB stick, chkdsk will freeze if running on disk when it tries to move from one BD save folder to another. Waited for 30+ minutes and it didn't move, said it had gone through the files in the first BD save folder it reached, and then nothing. (Stick is FAT32 so could set it to show me exactly which files it checked to verify. Also deleted the folder it had checked and the next one it should have checked, tried again and same thing with the next one.)
Now there are no other problems on the stick. Deleted all BD saves off it again, can check the rest just fine and no issues. Also checked the HDD and no issues there either.
(As for why they're on the stick, too many HDD failures, including one just recently, so learned my lesson years ago, have a script that backs stuff up daily on a secondary HDD and occasionally I also update a 2nd backup, with the stuff I can't just get again, manually, on an USB stick. Of course, that was done mainly for documents and such, but as of some point I decided to add game saves in it too, and certainly didn't have any problems with any before... Can of course just set the script to ignore the BD folder when updating stick, whenever I'll update it again, but it's... curious to say the least.)