Using latest TeXShop, latest ConTeXt beta, and latest Moajve,

run the file

\starttext

\quotation{tufte}

\page

\quotation[tufte}

\stoptext

The PDF preview is grey. Fix the error: \quotation[tufte} —> \quotation{tufte}

Re-run the file. The PDF preview remains gray. Print the PDF file or view it in full screen mode, the output is correct.

\page is essential for some reason.

Alan