I have recently updated to 13.10 from 13.04 and noticed a compatibility issue between the new Ibus and the Tor Browser.
Basically, the Tor Browser does not accept any keyboard inputs, while all other programs do. I tested this with the 64 bit versions 2.3.25-11 and 2.3.25-13 and the 32 bit version 2.3.25-13.
According to this thread, quitting ibus "fixes" the problem:
Any ideas on how to fix this?