As part of a string of problems with recent updates in Gnome Flashback (like this, and this), after an update a day or so ago, the shortcut keys I have assigned for switching between Japanese and English stopped working.

I use iBus and Anthy on Gnome Flashback. I have set the shortcut keys to be ctrl+space, but it doesn't respond at all. I have tried changing the keys in the "Text Entry Settings..." interface, but it doesn't seem to matter what keys I opt to use.

I can still switch input methods by clicking on the applet icon in the gnome panel and selecting from the options that drop down, but when typing a lot and switching constantly, as I am almost always doing, having to do it that way really sucks.

How do I get the shortcut keys for switching input methods to work again?