Yea, Ive noticed it for a few weeks too. It was a different app before
Dropbox before but now its been dropbox for a week or to.

Ive noticed that too that I can get around it but, since its every time
I was wondering if it was something else.

I found in the forums someone said to use 10.10 instead of 10.04 in
checking for updates but, since 10.04 is LTS I would rather not.