After upgrading evolution to 2.28.1 I encounter an immediate crash whenever I click on either "reply" or "reply all" buttons. Seems like ubuntu people have the same issue: https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/459929
The ubuntu bug backtrace is fairly incomplete, please provide a full backtrace. [1] http://www.gentoo.org/proj/en/qa/backtraces.xml
also emerge --info would be useful