I can verify this bug. It's a bad one. Occasionally all EnderIO facade blocks will also glitch out. Switching to TE's wrench (or the native Yeta Wrench) seems to make it even worse. The item conduits are there, but trying to work with them is almost impossible. Pressing F3 + A for a chunk refresh can make them appear momentarily. I updated the EnderIO mod version to the newest (it's only one version newer than the actual pack's version), but this didn't help. Updated to newest Nvidia video drivers (I was a couple behind since Win10 install), but that didn't help either.
Worth noting: Not ALL places where item conduits are placed are effected. It's possible it could be specific to an area where a filter is in use. Switching to "Fast" graphics seems to help a bit, but it still glitches out. I'm testing it further. I'm going to disable FastCraft and see if that helps. Hope this gets resolved as I do NOT want to go ripping out miles of cable stretching all over my base. The new EIO textures are pretty pimp though!