I am using the latest TeXLive update version of MKIV (used tlmgr to update). In a compile time message Context says that it doesn't like: " ! Argument of \celsius has an extra }. system > tex > error on line 15 in file degree-problem.tex: Argument of ... " -------------------------------- example macro document \starttext Temperature is in \celsius which seem cooler than degrees K, but really are not. \startfact \fact specific heat for water ... \celsius is much greater than air \\ x \\ y \\ \stopfact \startlegend \leg Temperature \\ 5 \celsius \\ xyz \\ \stoplegend \startformula \frac{j}{ m^2 \cdot s \cdot \celsius } \stopformula A formula by itself: \frac{j}{m^2\cdot s\cdot \celsius} continuing text. \blank A formula inlined: $ \frac{j}{m^2\cdot s\cdot \celsius} $ continuting text. \stoptext -------------------------------- end of example code The bad things that happer: Word mangling in the first threeconstructs: ------------------------------------------ which --> w◦Chich is --> i◦Cs ??? ◦Cxyz ? should the ◦C be separated from the xyz in a fact block? \celsius is getting cut out of the formula and put in after a newline in the last constructs. This may be an affect of the above problem, but I don't know. -------------------------------- please take a look at this. I just found out about a unit package, but this should work. Thank.