Strange Akonadi/Nepomuk problem

[O. Sinclair]

Since Friday I am having a strange problem. Am using Kubuntu 12.04 with 
KDE SC 4.9.2 and have had no problems with Semantic Desktop or 
Kontact/KMail for quite some time.

Meaning files are indexed, I can search, the "timelines" in Dolphin 
worked just fine (Today, Yesterday and so on). In KMail address 
autocompletion, Search etc worked.

But after a freeze suddenly no joy. From earlier experience I stopped 
akonadi, removed the nepomuk folder (.kde/share/apps/nepomuk) restarted 
akonadi and sat back while reindexing took place.

But for the first time this did not fully work. KMail works as expected 
but the systray "Desktop Search File Indexing" insists it is idle (even 
when it slowly reported increasing numbers of indexed file). In Krunner 
search for files only seems to work with files I have recently edited. 
In Dolphin the same and the "timelines" report like 3-4 files, searching 
for files give no result on files that have not been "touched" since the 
crash.

Anyone have an idea of what I can do to get the search functions back 
now that I had actually gotten used to them...

Kind regards
Sinclair