Playing on a 1.12.2 modded server. One of my players complained that he couldn't see all of the ME Glass Cables underneath our base. On his screen most of the cables were invisible and not interact able. Hwyla didn't show anything when hovering over where they should be, but they could still be broken albeit without any sound to indicate they had been broken. Walking into the cables still prevented him from moving forward as if there were something there.
The same issue began to happen to me, and so I did some troubleshooting. Adjusting graphics settings didn't change anything, nor did reloading the chunk. The chunk currently has a chunk loader on it so it shouldn't be an issue with the chunk not loading. Breaking the cables and replacing them temporarily fixed the issue but then they went back to being invisible.
The ME system still functions, so it's registering that the cables are present at least.
Using AE2 RV6 Stable 7 and Extra Cells 2.6.2a, full mod list is here in screenshots of the mods folder because I couldn't think of an easier way to share it. Also including screenshots of the issue, though you can't see much of anything because most of the cables are invisible. Also I'm aware that our setup isn't optimal, but we like it that way.