I had some issues all little niggly things with 2.4.13 in the end I decided to go the whole hog. I firstly moved all my needed files from phone to computer.
I then did a complete wipe
wipe data and factory reset
wipe cache
under mounts and storage
format the following System/cache/data/boot and sd card
then go to advanced and reboot recovery
then wipe data/factory reset again
then wipe cache again
back to mounts and storage
into mount usb storage
copy zip of miui and any other files you may need after reboot like titanium backup which you saved earlier.
now install zip from sd card
chose zip
miui zip and flash
All my little niggles went away and it is a whole lot quicker and more responsive.