I have probably played 10 full games(Starting at 1066) now and I have NEVER seen a single Catholic Spanish kingdom survive past 1130s. Muslims always take over Iberia. Tried mods to help it but nothing works.
EDIT: Apuila(The Normans in southern Italy.) always seems to get wiped by musliims from Africa too.
assasinate two out of the three kings early, and the remaining one inherits teh rest into a super catholic iberian kingdom
Seen the king of Galicia get lucky once and inherit Leon and Castille. Still didn't stop him from getting ganged up on and losing against every Muslim country in Iberia.
The Catholics losing in Iberia is a problem which has persisted since CK1.
It's not really a "problem" - especially vs. the berbers, it was always a possibility - but it should definitely happen a lot less consistently.