I downloaded a few newer .xci files such as
DreamWorks Dragons Dawn of New Riders.xci
Fate EXTELLA LINK.xci
Nelke to Densetsu no Renkinjutsushi-tachi Arata na Daichi no Atelier JPN.xci
OPUS Collection.xci
and can't get these to convert to .nsp using 4nXCI, I've never had a problem in the past...