Well.. I found the problem with the runtime error.
I went back to my original mod list, but encountered the same problem somehow. After some time, I isolated MCCD_1.04_MFCM_1.2.1_compatible. I mean, naturally.
Anyway, the new UI works great. The new option on the UI to go to decks awash depth is very cool. I set it to 7.00. Unfortunately, no matter what, I'm not going to 7. Same problem
The guy yells out, "7 meters!" I get the progress bar to the right, and it stays there. As the boat sits at 6 meters, the progress bar goes up and down a little bit along with the fluctuating percentage as the boat rolls up and down with the waves. 6.1-7.9 just appears locked.