Please check the settings in Player/Playback Options/DSP Studio.
Do you have the same problem as gappie?
Curious problem. I saw one item duplicated, Equalizer and a Chinese version for Equalizer (均衡器). Then I went to Tools > Options > Playback > DSP & Output Format..., and found the duplicate item there too.
After exiting the dialog and reenter it, the duplicate item is gone. EDIT: I must have gotten up too early this morning. The duplicate item is not gone. It is still there.
This is in the latest MC14 build.