Before reporting:

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Also, please give this issue a descriptive name that contains the game version in the title, eg.: "[1.12] Capacitor Interaction Crash"

Description of the issue:

As you can see by the attached video, when holding the engineer's hammer, the wooden posts will sometimes go invisible. The main issue though, is when trying to configure the pole to have a downwards facing support, which as you can see is invisible, and when placing a lamp below the invisible extension that appears, the post support is facing up.
https://imgur.com/7WR8AgA

Crashlog:

N/A

Versions & Modlist:

IE: ImmersiveEngineering-0.12-92.jar
Forge: 2847
Modpack: https://www.curseforge.com/minecraft/modpacks/capital-is-key
Modlist

The crash log with the mod list - https://pastebin.com/NuZESUYE

Cool.
Have you tried it with only IE installed?

Could you try it without foamfix?