Created attachment 2231 back trace from the Xorg log The Input Methods sub menu of the context menu causes X to segfault when it is highlighted. Attached in the back trace from the Xorg log.
Seems very unlikely this is caused by the terminal, probably some other bug in your system that is triggered this way. Backtrace is also useless for me. Closing this bug, but feel free to reopen it again if you can reproduce this crash in the Xfce terminal and not in (for example) the Gnome terminal.