To "fix" your lockscreen so the tap works you need to add a few png's on 4.3.1
Go into the com.apple.TelephonyUI bundle
find
bottombarbkground@2x.png and make a copy of it.
Rename that copy to:
BarBottomLock@2x.png
Make another two copies it and rename them to:
WellLock@2x.png
WellLock_T.png
Respring and it should work now.