Modpack version
1.83

Issue
The Advanced Rocketry machines have gone invisible in the latest version. They still work, but something made the blocks disappear. I tried this with both default and Sphax.

Thanks for the report. Are you using Optifine?

No, I don't have that installed.

Damn, that would've made this a lot easier :P I'll try to find out what's going on.
Have you added or removed any mods?

No, just did the update to 1.83 to see how well it works.

Broke and replaced the Lathe, and it looks like I had it turned around. Now it looks right.
Broke and replaced the Rolling Machine, and the configuration has completely changed for some reason. Now it looks right.
The Precision Assembler seems to work fine, so I don't think those machine structure blocks are actually invisible, I just don't remember them changing like that.
So, I think we're good.

I can't reproduce this issue - Have you tried breaking and replacing it?