This issue seems to be about transparent blocks like buildcraftpipes/gates or vanilla and railcraft booster tracks.
This used to work in the beta/alphas. It doesn't as of 4.0.0.2.

This does work:

UNLESS you place the bare frame supported wire first and the insulated wire second.

Frame supported bare red alloy wire alone works as well.

I know why, will fix.

Tell me?

Check out weakPowerLevel in red alloy wire part. Instead of checking if the mask connects outside, it should be checking if the mask doesn't connect internally. (It was a derp on my part, attempt to avoid internal connections leaking signals.)

Fixed via b55e505

Dude codes at the speed of awesome, methinks. =^_^=