Well two days into KDE4 I was forced to switch back, at least temporarily, to 3.5.8 – not because I wanted to, but because of a crippling bug that appeared out of nowhere. As of yesterday late, I can no longer add new widgets. If I click "add widgets" nothing happens.
I have not been able to find a source for the bug yet, revdev-rebuild says my system is perfectly consistent.
I also couldn’t print before (oddly, I was able to print from KDE3.5.8) but I have read that there is a problem with KDE4′s print system but it can use that for kde3 so I can investigate this.
Along with the widgets bug though, the system tray stopped working, trying to remove and readd it failed because I cannot add widgets.
I am left with nothing but a big WTF until I figure this out :S