This seem like bigger problem then expected. I had problem with input dialog boxes problem-with-input-method when I learned that I had some Chinese language in language preferences and couple of Thai input methods.
I started to remove all related data, many thai fonts, additional input methods, and when I selected
libthai-data from Synaptic, now it wants to remove more then 100 packages, everything I have installed including Unity, Compiz, Nautilus, Firefox...
I installed 12.04 on clean formated hard drive on the day it was announced, without selecting anything exotic, like other language then English and similar
Also when some dialog in Nautilus (not sure if it's globally) pops, then buttons are placed opposite than they should, and then quickly roll to normal position. I assume it's related to this issue, and also think that there must be some bug report already, as I downloaded ISO image from Ubuntu site normally, and followed simple installation instruction without tweaking anything.