Alt key does not work in xterm after Feisty upgrade

After upgrading from Edgy to Feisty, I found that applications running in xterm don't see the effect of the alt-key modifier. Specifically, running a shell (tcsh, in my case) inside an xterm used to allow emacs-style editing commands, such as alt-b, alt-p, etc, to work. In Edgy I needed some customizations to get this behavior: I run xterm with the option: "-xrm XTerm*metaSendsEscape:true". After upgrading to Feisty, however, this no longer worked. I backed off to the version of xterm in Edgy, however, and it still does not work. This implies the the problem is not in xterm itself, but I am at a loss where to look.

I tried several other -xrm options but without success. Following the advice given in bug #72530, I also tried those settings, but also unsuccessfully.

In case it matters, I have disabled /usr/bin/xkbcomp to address a different problem with xmodmap customizations[1] in bug #97175.

Ted

[1] https://bugs.launchpad.net/ubuntu/+source/xfce4-session/+bug/97175/comments/6