I use the latest release of WordPress on my blog http://www.fheinemann.de together with the K2 theme. But with opera as well as with the internet explorer the justification is broken at some sentences so that they are wider then they should be and lap over the navigation. Additionaly with the IE (6.x) the navigation isn't shown on the right side but under(!) all the posts...
I have the same problems with the default theme.
I think that is really anoying... Can anybody help?