In regards to the graphical glitches:
They don't entirely just seem graphical. It's a bit of a pain, since if you break them it seems to only return machine blocks? That is pretty nasty if it happens everytime. It's definitely annoying for me, since I live in the nether, and not many people venture down to there so far. So every time the world is unloaded, all my machines turn to the machine block skin.
Pretty horrible when you try to cable up something after it happens, since it just ends up going horribly wrong. I would say it might be worth looking into it personally.