korganiser missing icloud calendars

After the recent mess up with apple moving servers and introducing double security checks I finally got my icloud account back in korganiser; almost! some of the calendars under the same icloud account are simply not being displayed even though they appear in the list. I can add new entries which are then synchronised with the server and thus readable on other devices (eg iphone) but any older items or any entries added from a different device or the icloud web portal remain invisible in korganiser. this affects two of the four calendars I have on that account. I completely wiped akonadi and reinstalled the icloud account but with the same effect. This does NOT occur on evolution, where all calendars are correctly being displayed and instantly synched.

Any suggestions anybody?