This seems to be the week that all my technology does really irritating things.
Today my Bold 9000 with 4.6.304 firmware has this lock with a 1 next to it, suggesting I have some sort of security message or something, but I can't seem to find anything in any of the messenging apps and on top of that the thing makes my LED blink regardless of the profile selected.
Try doing a battery Call.
It looks like a new unread locked message or maybe your browser is logged into a secure website. Either way a battery pull should solve the problem.
If the first option doesn't work then simply search for a bb app called LEDReset which shopuld solve your problem.