[OS X TeX] Place holders

[Alain Schremmer]

About a year ago, I modified some of Will Robertson macros as in
 
         %Row1
                           option shift K
                    &    option shift K
                    &    option shift K
                    \\

where I used option shift K as a place holder.

Until recently, it worked well in that I could see where to enter stuff 
but the remaining "apples" obligingly didn't show on the pdf preview. 
(But they did as question marks when I sent a pdf to someone.)

Now, for some reason I wouldn't even try to fathom, it does not work any 
more. I don't know when it started but now I too get question marks in 
the preview or, occasionally, something that looks a bit like a lower 
case delta.

My question is whether there is a character that, like option shift K 
used to, would show nicely in the source but not in any pdf.

Regards
--schremmer



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