Just took a look at it. There is a fix on the bulletin board.
I just pulled off the latest fix from the bulletin board, and it appears to have fixed the problem with:
NHCE concentration %.
this was incorrect.
terminees who had less than 500 hours were properly excluded from 401(a)(4), included in the avg ben % test if plan was 401(k), but were not excluded from the NHCE concentration %.
They are now excluded from the NHCE concentration %. At least in my test plan! So go for it.