As shown in Figure,my desktop appear Black blocks sometimes.Usually appears when I am using the right-click.But it disappeared after I refresh desktop. <img src="https://thumbnail0.baidupcs.com/thumbnail/9046d6ba7efc3b438f2c1b7cb2119c16?fid=421628612-250528-932433722369376&time=1487473200&rt=sh&sign=FDTAER-DCb740ccc5511e5e8fedcff06b081203-l1FbxEmbN6Bypv9w0xVJwtj%2Bsl4%3D&expires=8h&chkv=0&chkbd=0&chkpc=&dp-logid=1147975987527899616&dp-call
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