Changing icon themes

Looking for confirmation: When I change the icon theme (KControl->Appearance & Themes->Icons), most of the icons change immediately but not all. I have to restart Trinity to force all icons on the desktop to update to the new theme. The kwikdisk icon is particularly persnickety at not changing without a Trinity restart. I do not have sessions enabled during this testing. I delete the ksycoca cache each time before restarting Trinity. Rarely (I can't repeat) Konqueror icons do not always immediately change either (I have the Konqueror preload option enabled, if that makes a difference). Although almost all of the time the konqueror icons do update immediately. Darrell