Hot Corners have visual representation on the screen

I don't know how I did it, but for any hot corner I have active, there is a visual representation that a corner is a hot corner. I see 1/4 of a circle in a light blue colour. If I turn hot corners off, the little 1/4 circle disappears.
Any ideas how to get rid of the 1/4 circles from the active hot corners. They never used to be there.
Thanks, B

Hi,
Thanks for your suggestions, but I don't have any of those type of programs installed. I have just got my MBP so have not installed very much at all.
Only tweak I have applied was to stop the computer waking from sleep when you open the lid, and that was done through terminal.
I am not too fussed about it, just feel like I have training wheels on

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