I'm on gentoo_rc6-15 with kde (kdelibs 2.2.2-r3 has been emerged). Other kde packages are latest versions. /etc/profile.env has following line export KDEDIR='/usr' It should be export KDEDIR='/usr/kde/2' I have no umerged /etc/.../._cfg... files.
profile.env is generated by concatenating the files in /etc/env.d (with a few extra operations). Please look there and post here the contents of your /etc/env.d/70kdelibs-2.2.2; here it contains KDEDIR=/usr/kde/2. If it contains /usr for you, try remerging kdelibs if you haven't yet. If you ahve say so here and we'll go on diagnosing the problem.
Since you haven't replied I assume the problem has either gone away or you are not interested in investigating further. Also noone else has complained of this and I annt reproduce it. So I'm closing it.