KThemeStyle cache seems corrupt!

[David M <eseol@tiscali.co.uk>]

Hello all I hope you can help with an annoying but not critical problem i have 
running an upto date (as of this morning) debian unstable.

The problem is when i run kde apps the following messages appear 

kdecore (KIconLoader): WARNING: Icon directory /usr/share/icons/hicolor/ group 
1
6x16/stock/chart not valid.
kdecore (KIconLoader): WARNING: Icon directory /usr/share/icons/hicolor/ group 
1
6x16/stock/code not valid.
kdecore (KIconLoader): WARNING: Icon directory /usr/share/icons/hicolor/ group 
1
6x16/stock/data not valid.
kdecore (KIconLoader): WARNING: Icon directory /usr/share/icons/hicolor/ group 
1
6x16/stock/document not valid.

etc etc etc KThemeStyle cache seems corrupt!

And the most annoying part is the long delay returning to kdm (approx 17 secs 
- this is long it never took this long) after logging out of any session.

Any solutions as to how to fix this would be greatly appreciated.

Thanks in advance 

Dave M