I get an error message which disapears immediately. Does this sound familiar?

Hi all!
I use my macbook pro(mid 2010, 10.7.3) alot. Probably 7 hours a day, 7 days a week.
From time to time I get a popup with an error message which disapears immdiately. I can't even read what it says, it's just a flicker in my screen. I do notice the yellow rectangle on the left of the errormessage but I have no idea what it says.
It probably shows up about twice a week and I have no idea what is wrong and what I can do about this. Restarting didn't fix it.
So my question, had anyone had this in the past? Is it bad and fixable? And above all, what does it say??
Thanks!
Joren

I sometimes had the OSX firewall trying to ask me whether this or that application shall be allowed to accept incoming internet connections. I constantly missed the "window of opportunity" to hit the apprpriate button.
This was a bug as the window always came up regardless of whether or not a setting for the application in question had already been made within the firewall.
Haven't seen the bug for quite a while yet, might have ceased with Lion in my case.

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