Fixing that problem is simple. Simply navigate to ThemeName.theme/Bundles/com.apple.TelephonyUI,
Rename the file "bottombarbkgndlock@2x.png" to "WellLock@2x.png" for iPhone 4. Rename the file "bottombarbkgndlock.png" to WellLock.png" for iPhone 3G/3GS. Respring device.