Sounds to me like facebook has froze your ability to add friends. Remember not to add them too quickly - especially if you are just starting out or have no networks or applications in common.
The best thing you can do is slowly rise by members who share a great deal in common with your profile - do not get any captchas wrong as you are adding as this will flag your account for a 24 hour period monitoring your process.
Try to not ever add more than half of the total friends you have in one day (excluding your first day where you should add 100-200 tops)
Try a new account or check the settings and internet connectivity of your facebook blaster pro because that could be a problem too.
Mine is still working fine for me