This has happened to me three or four times now. Sometimes after finishing a song while the high score, rate, ect. screen appears my name appears as normal then the box fades away; I can still see numbers added/subtracted, but nothing it's adding/subtracting from!! After this the box doesn't appear anywhere except the online list (F9). It's not in the bottom of song select and the top-left of the main menu! And when I click the spot where it should be in the main menu it doesn't do anything. This effect lasts in-till I close Osu! It returns after I re-open Osu!. I didn't find any specific thing to trigger this, but this last time I played with this happening was Lollipop [Hard] and my box dissapeared and I saw a -0.01% where accuracy was.
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Screenshotz: