KDE3.4/KMail/Filters in toolbar problem

In my 3.3.x setup I had a couple of custom filters set up for when messages were incorrectly marked by bogofilter. Basically I could select the messages, and click on one of the toolbar icons (Spam/Ham). This would run the appropriate filter, which would educate bogofilter, mark it as Spam/Ham, and move it into the correct folder (Spam/inbox). Today I upgraded to KDE 3.4, and the toolbar buttons had disappeared. When I try to add them KMail crashes, taking KOrganizer with it. I can restart it, and it starts OK, but moving to other components tends to crash the lot again. By changing the toolbar without moving to any other screen I can remove the problem buttons. Anyone else experiencing this? -- Steve Boddy