[NTG-context] \startalign[n=3] don't work properly in MKIV

Hi, the following minimal example works fine in MKII, but the third columns are not aligned in MKIV \starttext \startformula\startalign[n=3] \NC X \NC = 1 + 2 \NC = 3 \NR \NC Y \NC = 1 + 2 + 3 \NC = 6 \NR \NC Z \NC = 1 + 2 + 3 + 4 \NC = 10 \NR \stopalign\stopformula \stoptext Is this a bug or the interface has changed in MKIV? $ context --version mtx-context | current version: 2011.09.06 17:46 $ luatex --version This is LuaTeX, Version beta-0.70.1-2011051918 (rev 4277)