Excessive CPU use from virtuoso-t

Over the weekend I upgraded to 

Kubuntu 12.04 upgraded
Qt: 4.8.2
KDE Development Platform: 4.9.3
Kontact: 4.9.3

I haven't really had the opportunity to evaluate things but the "conflict 
resolution" messages may well be gone.  But one problem I've had since the 
prior release is still there - when I enable "Nepomuk Semantic Desktop" the 
virtuoso-t  process starts chewing CPU starting at 1 core of 6 (so 16%) and 
eventually climbing to 3 of 6.  Kmail has trouble fetching mail, the headers 
come though OK but the bodies are delayed.  Sometimes it seems to take a 
couple of requests to fetch the body of an email (a 'reply' or 'forward' seems 
to help).

I left it running for 9 cpu days with no improvement before trying something 
else - I turned off the Nepomuk File Indexer but left .  On logging out and 
back in a very curious thing happened - the nepomukservicestub started 
consuming 4 or 6 cores and the virtuoso-t process had only one.  I was unable 
to start kontact or even akonadiconsole.  Since I couldn't access email at all 
I shut it off completely and rebooted.

It sure looks like a deadlock issue, or perhaps something in my configuration 
or setup that's hanging things.  I can live without the file indexing but it 
would be nice to have my email indexed but right now I don't have the time to 
wait for email.

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