Every time i logged on, kactivitimanager crashed sooner or later. Also Kmail 
crashes very often while using.
Virtuoso-t process consumes about 30% of my Quad-Core CPU load, although strigi 
doesn't index anything.
I also noticed a strong delay when logging in, until kmix, klipper and strigi 
symbols came up.

Some of my interestingly findings:
After logging into the desktop, before the activitymangerd crashes, the akonadi 
test results was fine, after the crash the following fault was in:
Nepomuk search service not registered at D-Bus.
If the crash happens very early after log in, the kmix, klipper and strigi 
symbols doesn't came up at all sometimes.

I tried every forum and bug report hints i could find, nothing works until...
I deleted the following directory ~/.kde4/share/apps/nepomuk (while not logged 
into kde of course).

Logging in is pretty fast now, kmail much more responsive than before, and 
kactivitymanagerd doesn't crash once since this.
Akonadi's error log is clean now and hopefully stays so. 

So that's the solution for me and also for another guy who takes this
advice, I gave to him in the gentoo forum. Eventually this is the reason
for some other bugs like the virtuoso CPU consumption Bug 293641 and one
reason for kmail crashes too - hopefully.

So give it a try, but beware of the fact that if you've done some tagging of 
indexed files, this would be lost in this case and a new re-indexing of your 
hard drive is necessary!
Do a backup before or something else to save your work, if its important for 
you.

Much success, Andy.

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https://bugs.launchpad.net/bugs/966247

Title:
  kactivitymanagerd crashes on login

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