Installera om 10.8.2 combo update hjälpte inte.
Detta kan jag läsa i "systemmeddelanden" när jag försöker logga in
2013-01-02 21:09:22,863 Messages[2931]: [Warning] Empty account query with service: iMessage
2013-01-02 21:09:22,897 apsd[90]: Certificate not yet generated
2013-01-02 21:09:34,673 apsd[90]: Certificate not yet generated
2013-01-02 21:09:52,989 apsd[90]: Certificate not yet generated
2013-01-02 21:09:53,005 imagent[148]: [Warning] *** Listener ID: com.apple.mail does not have capability: (Status), not allowing request
2013-01-02 21:09:53,006 imagent[148]: [Warning] 1 IMFoundation 0x00007fff8a8e6be2 IMLogBacktraceToDepth + 69
2013-01-02 21:09:53,006 imagent[148]: [Warning] 2 imagent 0x00000001056eede8 imagent + 81384
2013-01-02 21:09:53,007 imagent[148]: [Warning] 3 imagent 0x00000001056eff6a imagent + 85866
2013-01-02 21:09:53,007 imagent[148]: [Warning] 4 CoreFoundation 0x00007fff837af63c __invoking___ + 140
2013-01-02 21:09:53,007 imagent[148]: [Warning] 5 CoreFoundation 0x00007fff837af4d7 -[NSInvocation invoke] + 263
2013-01-02 21:09:53,007 imagent[148]: [Warning] 6 CoreFoundation 0x00007fff837af6a9 -[NSInvocation invokeWithTarget:] + 57
2013-01-02 21:09:53,008 imagent[148]: [Warning] 7 IMFoundation 0x00007fff8a8e35d5 im_local_object_peer_event_handler + 7128
2013-01-02 21:09:53,008 imagent[148]: [Warning] 8 IMFoundation 0x00007fff8a8e36b3 im_local_object_peer_event_handler + 7350
2013-01-02 21:09:53,008 imagent[148]: [Warning] 9 IMFoundation 0x00007fff8a8e3767 im_local_object_peer_event_handler + 7530
2013-01-02 21:09:53,009 imagent[148]: [Warning] 10 Foundation 0x00007fff8313a677 __NSThreadPerformPerform + 225
2013-01-02 21:09:53,009 imagent[148]: [Warning] 11 CoreFoundation 0x00007fff8373b101 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
2013-01-02 21:09:53,009 imagent[148]: [Warning] 12 CoreFoundation 0x00007fff8373aaed __CFRunLoopDoSources0 + 445
2013-01-02 21:09:53,010 imagent[148]: [Warning] 13 CoreFoundation 0x00007fff8375ddc5 __CFRunLoopRun + 789
2013-01-02 21:09:53,010 imagent[148]: [Warning] 14 CoreFoundation 0x00007fff8375d6b2 CFRunLoopRunSpecific + 290
2013-01-02 21:09:53,010 imagent[148]: [Warning] 15 Foundation 0x00007fff8314289e -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 268
2013-01-02 21:09:53,011 imagent[148]: [Warning] 16 Foundation 0x00007fff830db18a -[NSRunLoop(NSRunLoop) run] + 74
2013-01-02 21:09:53,011 imagent[148]: [Warning] 17 imagent 0x00000001056e30ab imagent + 32939
2013-01-02 21:09:53,011 imagent[148]: [Warning] 18 libdyld.dylib 0x00007fff880787e1 start + 0
2013-01-02 21:10:23,000 apsd[90]: Certificate not yet generated