I'm on Forge 1207, MC 1.7.10. Mekanism build 7.1.0.92. Basically, I have a row of machines. One from TE, one from Mek and one from EIO (Alloy Smelter). All the others are fine, except the Alloy Smelter. It's internal energy buffer refuses to fill if its power source is from Mekanism. Even if I use the EIO power cables. Have not tested extensively yet (need to sleep), but I'll gather anything you need. (FYI, the Alloy Smelter charges fine when hooked up to a TE Dynamo or BC engine)

And sure enough, I'm on build 194. Sorry for assuming it was you guys. I should have checked them too.

What version of EnderIO do you use? The following is from the changes log of the mod:
#195 (Aug 26, 2014 8:31:58 AM)

Lowered default power use of DS boots. (commit: 726ab8b5a6cd57a811ba321ca80e9199c025b9a9) — CrazyPants / detail
Fix DS Pressure Plate not dropping with painted data (commit: a3ac86e3f85d6167d589fa9dec87c2f3531e7989) — tterrag1098 / detail
#925 EnderIO Machines will not accept power from Universal Cables (Mekanism) (commit: 2a6b99bd1522ee6c19b114f701429da435ad152f) — CrazyPants / detail