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I 've tried last dshowhelper (v.76). I got these situation

tipycally I use Media Portal on plasm at 50HZ. and I've no problem. Testing new dshowhelper I tried MP on lcd Asus monitor at 75 HZ. Why that difference. Same multimedia file , same filtergraph, same pc. same issue with dshowhelper v.55 the stable one according owl thought;