When using X11 port forwarding, X11 protocol errors are encountered for operations on the X11 clipboard. In particular, xemacs hangs with an X11 protocol error related to the clipboard if CONTROL-K is used to delete a line. I assume that there is some corruption in the X11 data stream. Reverting to 3.7.1p2 (previous working version for me) seems to avoid the problem.
Additional information regarding the build: Software versions Solaris 9 GCC 3.4.0 OpenSSL 0.9.7d Configured with options: --with-cflags=-O3 '--with-ldflags=-L/usr/local/lib -R/usr/local/lib' --with-pid-dir=/var/run --sysconfdir=/etc/ssh Problems are clearly due to the ssh client program since they also occur when using ssh to a Gentoo Linux system with an sshd (version 3.8p1) which has been working fine for several months.
Have you read http://www.openssh.com/faq.html#3.13 ?
Five months, no reply == closed bug
Change all RESOLVED bug to CLOSED with the exception of the ones fixed post-4.4.