Description of the issue:

Issue 1:
The Engineer's Toolbox GUI shows the "name" of each slot if you hover over them, but it's not showing the "item" texture (like where the hammer goes, wirecutters, etc)
pic: https://imgur.com/a/pwFoISO

Issue 2: IIRC you can open the Engineer's Toolbox when placed in the world, this is not possible right now. It works correctly when holding it on your hand though.

Crashlog:

No crash

Versions & Modlist

Minecraft 1.15.2
Forge 31.2.19
ImmersiveEngineering-0.15-103-40a7f41c (#7 in jenkins)
jei-1.15.2-6.0.0.4

I'm not sure what you mean in the first issue. There isn't any specific slot for the hammer, the wirecutters etc., they can go anywhere in the "tools" section. And I don't really see any difference between your screenshot and what I see in my 1.12 workspace.

For the second issue: Does this only happen on dedicated servers? It works fine for me in singleplayer.

AFAIK it only happened in the IE server! So I assume it's a server thing (happened to the other players too)
Regarding the first thinjg about the GUI just ignore it, I was sure it was a thing. Perhaps an addon changed the GUI? I'll do some testing later.

I forgot to mention, when placed in the world, I'm almost 100% sure that it's placed facing the opposite direction.

It happens in SP for me also, and I made a new clean instance with only IE and still can't open it when placed in the world

Fixed in e933197