kde-4.5.3 seems really rough.

[José Matos]

On Tuesday 09 November 2010 21:27:42 Manuel Escudero wrote:
> @Linuxguy123: Reset your KDE settings by erasing the ".kde" folder hidden
> in your home folder,
> Turn off desktop effects and
> Log out and then log in again and customize your KDE as it was before,
> you'll notice a better behavior

Please do not that unless it is a last resort. You will loose configurations 
and worse than that personal data (like kmail folders and similar).

Please do propagate this type of advice. :-(
-- 
José Abílio