CacheTT giving "width overflow" error

[BobH]

This problem was brought up briefly some years ago on http://forum.fontlab.com/archive-old-fontlab-forum/problem-with-width-overflow-t2534.0.html, but I don't see an answer there.

We have a couple of fonts for which Microsoft's CacheTT program gives width overflow errors e.g.:

    Warning: hdmx table records with ppem >= 11 not generated due to width overflow
    for glyph index 1077.

It isn't obvious from looking at the identified glyphs in FL what might be going wrong. Does anyone have any suggestions on how to diagnose this problem?

Thanks,
Bob

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