A few months ago I blogged about font rendering in KOffice. The problem has been discussed and analysed a lot on the last KOffice meeting and the KOffice forum. The conclusion was that the problem can’t be fixed inside KOffice, but needs to be fixed in Qt. Since the problem is far from trivial and we don’t have developers with experience in that specific area, we rely on Nokia to fix the problem. Problem has been reported in two bugs here and here. Unfortunately the bugs have very low priority at the moment, so we need to make clear to Nokia how much these fixes are needed.
Everybody who is bothered about these rendering problems please vote on the two bugs I pointed out above.
In case these bugs don’t get fixedm a possible plan B would be to switch the rendering to use Cairo + Pango. Till then you can try to work around the problem as I have pointed out in my old blog post.