

Recently the application icons in Spotlight's search window look odd.
There's no problem with the search itself, Spotlight hasn't slowed down, the indexing seems ok, in fact the whole system appears to be ok, let aside these odd looking icons.
???
Logging out or restarting the system works for a while, 3 Spotlight searches to be precisely, the icons are fine for a while, but the fourth search returns every application icon the way it is seen on the screenshots I made.
What I already tried:
A restart
Repaired permissions
Cleared cahes
Updated prebinding etc.
Update the whatis database
Cleaned font cache
Deleted Spotlight's preference file
and many many restarts
Again it works for a while, but the fourth Spotlight search will give these annoying corrupted icons.
Has anyone seen this before?
What may be the cause?
And more important: can it be fixed?
Thanks in advance!