[OS X TeX] Running out of \write's while building a grouped-by-chapter symbol index

[George Tourlakis]

Hi folks,

I have encountered an unfamiliar (to me) problem: 

I am wrapping up a text book project. Creating a single symbol index was easy but useless, as symbols were listed randomly (vis a vis page numbers).

So I turned to a by-chapter symbol index (but still one that is placed at the end of the book, the symbols grouped by chapter). This time compilation halts with a "too many \write’s" error message. (I have 16 chapters, 0-15; if I try to print a by-chapter index for the first 7 or so chapters only, then I am OK).

Any suggestions for a workaround?

Thanks,

Cheers
George