Is your Apex at version 1.3.2 or higher?
I won't know how to even start diagnosing this. My app checks that the Apex Pro unlocker is installed before it does its part, and does it by package name, "com.anddoes.launcher.pro". Can you check your device's system settings to see if the Apex unlocker is installed? Also, perhaps you could restart the device in case something got "stuck"?