I was messing around in creative with the DFC when I managed to fill up the FEnSU. The energy level went back to 0 and the wheel of the FEnSU completely disappeared.

The FEnSU uses the maximum long limit as the maximum power, so overfilling it can cause some large problems (causing the float value to overflow and break textures/values). It's not easy to fill up the FEnSU though, and there's not much of a way to fix the issue other than decreasing the maximum power storage.

Should be fixed in the most recent version, DFC beams now have a cap on how strong they can be, preventing overflows and negative values. Hasn't been tested with binary star setups so I'm leaving it open until I get confirmation.

Wouldn't it be better to decrease the power buffer to like 9.20EHE, rather than putting a cap on DFC beams? Even with a high energy field jammer they cannot generate more than 10.8PHE/t, which is capped by the size of the core's tanks. Perhaps shrinking FEnSU's power buffer a little bit could also fix the problem...