Installed 4.3 the other day and like it a lot, much that has improved on 4.2.4 (sound works much better, for some reason). But there's a video problem with Virtualbox running XP: when started (and I run VB in seamless mode usually, but similar problems occur whenver it's not maximised) the screen background around the Windows application is solid black for what seems an eternity (well, about 30 seconds) before everything returns to normal. It seems impossible to switch out of seamless mode, the XP desktop gets corrupted (no window decorations etc).
Has anyone else experienced similar problems? All was fine with Virtualbox under KDE 4.2.4.