[NTG-context] Is startcombination ... stopcombination broken?

I'm trying to bring two pictures next to each other by using \startcombination, but I always get this error (on my box + on contextgarden): ! Missing { inserted. <to be read again> \egroup l.5 \stopcombination ? ! Emergency stop. <to be read again> \egroup l.5 \stopcombination Minimal example: \starttext \startcombination[2] \framed{here} \framed{there} \stopcombination \stoptext I have tried with all kinds of braces in all possible places, to no avail. Or am I missing anything terribly obvious? Best Thomas