Hi, It seems that with the recent updates, I found that the following minimal example does not work in mkii, while it does in mkiv: \define[1]\MyTest{The test variable is #1.\par} \starttext Is this a bug in mkii? \MyTest{3} \stoptext Am I doing something wrong, or mkii has changed despite being officially « frozen », a side effect of the global warming…? :-) Best regards: OK PS: the version I am using is ConTeXt ver: 2012.01.16 18:33 MKII, and the error message says: (/context-minimal/tex/texmf-context/tex/context/base/spec-fdf.mkii)) Runaway argument? {The test variable is ##1. ! Paragraph ended before \complexdefine was complete. <to be read again> \par l.1 \define[1]\MyTest{The test variable is #1.\par } ? Process aborted