I launch Terraria, I close it, I open Ccleaner and ''look for Registry errors''... and this is what I will get *all- the- time*, every time : http://imgur.com/a/YxqiC
It's really nothing serious, apparently, but this has been going on for months, if not years at this point.
I have always found this weird, and kinda expected someone else to report this a LONG time ago... but, it seems no one ever did, so there I am.