spell checker

Why are the red underlined words in the Dutch dictionary no longer recognized by the PSPad spell checker since one of the last updates?

See below part of the Dutch glossary list

run
irus
irvington
irwinboor
is
IS
isa
Isaac
Isabel
Isabelbeer
Isabelklauwier
Isabella
isabeltapuit
isacker
isaeus
Isafjord
Isafjordhur
isagogiek
isagogisch
isai
isametrale
isanomale
isar
isarco
isatus
isbergues
ischemie
ischia
ischialgie
ischia's
ischiaslijder
ischurie
ISDN-kaart
ISDN-kaarten
Isebaai
isebel
iseghem
isel
Iseljord
iselle
iseo
isepiptese