On 2014-02-26 Jan Tosovsky wrote:

when a long primary is preceded with the secondary or tertiary index entry, the second line is not indented as usual, see the following example:

\setupregister[balance=no] \starttext \index{primary+secondary+tertiary} \index[primary long]{\dorecurse{5}{primary long }} \index[primary longer]{\dorecurse{5}{primary longer }} % but this is Ok \input{tufte} \completeindex \stoptext

I've tested this in new beta and the issue is still there... Jan