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It's always shown up after this recent patch, it has to have been some change in dominion resources. It's at every resoultion at every level of character, shadow and environment detail setting. I've tried every setting in the ingame options. Here is a LoL forum thread with a lot of other players experiencing the same, some of them have picutes.
Riot ''Support'' Replied that this is considered 'feedback'', but I suggested feedback is based on opinions.