I just ran into the same issue. I can create 11 map_pin_letter
markers, but when I add the 12th no markers show.

I've changed chof to validate and I get :

The parameter 'chem=y;s=map_pin_letter;d=H,FF0000;ds=0;dp=3|
y;s=map_pin_letter;d=E,00C000;ds=0;dp=5|
y;s=map_pin_letter;d=M,FFFF00;ds=0;dp=9|
y;s=map_pin_letter;d=M,FFFF00;ds=0;dp=18|
y;s=map_pin_letter;d=M,FFFF00;ds=0;dp=21|y;s=map_pin_letter;d=E,
00C000;ds=0;dp=22|y;s=map_pin_letter;d=E,00C000;ds=0;dp=25|
y;s=map_pin_letter;d=H,FF0000;ds=0;dp=32|y;s=map_pin_letter;d=E,
00C000;ds=0;dp=34|y;s=map_pin_letter;d=E,00C000;ds=0;dp=35|
y;s=map_pin_letter;d=M,FFFF00;ds=0;dp=38|
y;s=map_pin_letter;d=H,FF0000;ds=0;dp=40' does not match the expected
format (INTERNAL_REGEXPVALIDATOR_ERROR).

Anyone have some suggestions?

On Jul 6, 3:02 pm, KeithB <[email protected]> wrote:
> Hi Toby,
>
> Some extra info, but no answers:
>
> Working Chart (11 markers):http://tinyurl.com/23egvqw
>
> Non-working Chart (12 markers):http://tinyurl.com/26sffn3
>
> Chart API validation of non-working chart:http://tinyurl.com/29hk5pe
>
> Validation Response:
> Warning
>
> The Chart API request contains the following warnings:  "The parameter
> 'chem=...' does not match the expected format
> (INTERNAL_REGEXPVALIDATOR_ERROR)."
>
> Besides confirming your results, I haven't played around with
> differentCHEMparameter values to find a possible cause (besides the
> total number of markers).
>
> Good luck,
> Keith

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