Could it be your using a different icon set then Oxygen?
ya know what??? tht maybe it!
hang on...gona bot the notebok now...
(Pause as Mark grabs his new Lenovo Thinkpad edge.)
Well, I was using the Oxygen icon set.
I switched to another icon set and then another and another, then switched back. I then closed KMyMoney, re-launched it and...
Bingo! there's the icon!
Marking this solved now.