Kontact KDE4 on 11.1 crashing

¨Kontact¨ on my system (11.1/KDE4) has started crashing withe the following messages. I cannot get it to start anymore.
The separate applications like Kmail, Knode etc run fine if I start them outside of Kontact.
Has anyone seen this?

Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
qUncompress: Z_DATA_ERROR: Input data is corrupted
kontact(10729): stream is bad :frowning: status= 2
*** KMail got signal 6 (Crashing)
<unknown program name>(10726)/: Communication problem with “kontact” , it probably crashed.
Error message was: “org.freedesktop.DBus.Error.NoReply” : " “Message did not receive a reply (timeout by message bus)” "

KCrash: Application ‘kontact’ crashing…
sock_file=/home/jerome/.kde4/socket-bigzen/kdeinit4__0