Me knows a couple floofs who are unable to access the more populated maps such as Bonfire Island or Fluorite Plains. Though the reason behind I am a bit uncertain.
It could be since Fluorite Plains is so heavily populated, the immense amount of individuals compacted in that one map may be interferin' with yer computer's ability to load/function with said map due to all the possible lag (especially around the portals) and activity constantly takin' place there round the clock. Thus, as a result causes yer FeralHeart to crash. Yer friends might be able to access the Plains due to their softwares are more suitable/can with handle more while yers may be a bit more sensitive.
Not sayin' this is the precise cause but assumin' ye' haven't fiddled with anythin', I do not think there's been a solution configured to solvin' this as of yet less I'm mistaken.