I updated from 3.0.8 to 3.0.10 and now when clicking on a Basic Flux Storage Device it says:
UUID IS INCORRECT: TRANSLATION ERROR
I can destroy it and reconnect it back to the network and it works until I log out (or probably leave the area)
and it fills up with the energy again. But when I relog it goes back to looking like it has no energy and then gives me the same UUID error.

That's very odd. This is sent as a message when you click on it? Are you still able to open it?
Are you using an official version of mc?

Also server or single player?

Yes, an official version of Minecraft. Forge 14.23.2.2611, and on a server. I am not able to open it until I destroy it and replace it. It is a message in my chat box. It still provides power though?

Have you encountered this with Flux Plugs or Points?

No, Only the Basic Flux Storage, I don't even know if it does it for the upgraded storage ones or not, I haven't built them yet.

Also When someone else places it and I try to interact with it I get "Player Name: TRANSLATION ERROR"

Update: the upgraded ones also do it

Hi, i can confirm this - using Forge 14.23.2.2611.

Some things i came across:

If i place a Storage (don't matter if gargantum or other) i can access and configure it, but some time or a server restart i get "UUID is Incorrect : Translation Error"

If another player places a not configured storage i get the message: "$Player_name : Translation Error"- the one that placed it can access it and change the settings - after that i can access the storage (note: we both are validated for the network he chooses).

I hope this helps.