The ubar and vbar in *.ini and *.clm files of Sandy example

[limaolin]

I make the Sandy example run under the roms model only. When I set the DT == 30.0d0 15.0d0, it's blowing out. When I set the DT == 12.0d0 6.0d0 or DT == 6.0d0 3.0d0, it's OK.
I used the ncview to see the differents of the *.bdy, *.ini and *clm files in your example and my own.
I found that : (1) the Vars in *.bdy were same; (2) the Vars in *.ini and *.clm were same execpt ubar and vbar.
What's the reason of this problem, how can I solve the problem.