Re: Yellow Exlamation mark....
IT was finding something wrong with either your Automatic Updates not set to Automatic, yoru firewall settings were off or it didnt find a Anti-Virus. That woudl be why the Question Mark was there and why it stayed. Turning off the security Center stopped you from recieving those warnings.
I do not accept support questions via EMail, PM, IM or my G+ page!
Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher