Right now there's no current flowing through it; does it only block current when current exists?
EDIT: Looked at some bug reports and fixed it.
Should this splitter cable be open or closed?
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Wtf!?! Try getting rid of the cable or add a couple eus to that mfsu and test it. It should always be redstoned I think. Tested this as I wrote. I am flabbergasted. Methinks its a graphical glitch. Again try putting Eus through it -
No Glitch, thats a Bug and Richard claimed he fixed that (what he did partially and only for the Detectorcable)