I found if you tried to alter the startup programs while the bug was still present and then updated the system after the fix was released, this little notification seems to be more likely. It's nothing to worry over and when it pops up just close it. There is nothing that its really reporting, its do to the update snafu with lxsession.
I haven't had time to track it down yet, as far as getting a real solution to it, but I know what it came from and realize its nothing major. Once I figure out a real solution to it popping up, I'll post it here. :)
Thank you! The system is stable, only this message comes and nothing happens. I will check the link with the solution above. The main user of our lxle-pc is 2 years old, surfs in Internet, plays games and has a collection with pix of cars.