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The code in \seeindex has a bug. There was something in the mailing list about a year ago (2004-06-21), but as far as I can see, the patch Hans proposed then has been integrated into core-reg.tex. Here's a minimal test file: \starttext This \index{this} and \index{and} that \seeindex{this}. \placeindex \stoptext And the error log: ! Argument of \@@filterlevelpart has an extra }. <inserted text> \par <to be read again> } \doifprevlevelelse ...tor \@@filterlevelpart [#1]} \edef \@@tocsectiontype {\... \dosetpageregisterpage ...->\doifreglevelelse [#5] {\dodosetpageregisterpage ... l.46 ...isterpage{index}{,}{3}{2::0:0:0:0:0:0:0}{} Unfortunately, the bug messes up the .tui file, so even if you delete the \seeindex command, the file will not compile unless you delete the .tui manually. Ideas, anybody? Best Thomas