This is a regression caused by ibus 1.4 to 1.5 API transition.
As reported to http://bugs.debian.org/725379 bug for Debian by Olaf:
The problem comes about as ibus-1.5.0 dropped the enabled, disabled, is_enabled API from ibus.InputContext. The IBusELInputContext class used in ibus-el-agent derives from ibus.InputContext and still relies on this API being available.
This is a regression caused by ibus 1.4 to 1.5 API transition.
As reported to http:// bugs.debian. org/725379 bug for Debian by Olaf:
The problem comes about as ibus-1.5.0 dropped the enabled, disabled,
is_enabled API from ibus.InputContext. The IBusELInputContext class
used in ibus-el-agent derives from ibus.InputContext and still relies
on this API being available.