Same here, description is same with j_thomson27 above. Getting really frustrating. I'm on Xperia V.
Edit, a bit more details:
My phone is LT25i.
Problems started after 4.3 upgrade.
I tried the clearing of all the cache and force stops from the apps, then restarting - only to now have Chinese default keyboard which I cannot change.
Trying to change the Default keyboard from Language & input settings will result in immediate reboot of device, same when trying to switch input method from any app.
...and latest 9.2.A.1.199 upgrade of 4.3 did not fix it.
Funny, for every app you can easily email or report of any mishaps and the fix is there sometimes within hours.
I have yet to find any way to inform Sony directly of SW faults in the device itself. If anyone knows how to report these issues, please let me know!
Edit II:
Got it fixed by running the repair on the PC Companion.
It does not make me altogether happy, though, as it's a lot of trouble going through - the repair practically factory resets the phone and you need to set everything up again.
On the other hand it does clear the table, which is always good.
Edit III:
After the phone just sat alone for the night the problem is back in the morning.
I posted this issue also to the Xperia V forum, if interested, check there if there'll be any answers
http://talk.sonymobile.com/t5/Xperia-V/Input-method-switch-causes-reboot-after-4-3/m-p/602989#U60298...
