I have components written during Winter'18. After the rollout of Spring'18 preview they stopped working. The components fetch fields (either via layoutType=FULL or mentioned by name) that happen to be formula/rollup fields and when the save operation is called an error is returned.
INVALID_FIELD_FOR_INSERT_UPDATE","message":"Unable to create/update fields: X__c, Y__c, Z__c. Please check the security settings of this field and verify that it is read/write for your profile or permission set."