On Fri, Dec 28, 2012 at 1:21 AM, Yue Wang wrote:
> Hi Hans,
>
> can you fix the problem? thanks a lot.
>
> test document:
> %mkii
> \usetypescript[lucida][texnansi]
> \setupbodyfont[lucida,12pt]
> \starttext
> 5\%  $5\%$
> \stoptext

Citing myself:

On Sat, Feb 20, 2010 at 6:22 AM, Mojca Miklavec wrote:
> On Tue, Dec 1, 2009 at 10:16, Hans Hagen wrote:
>> Yue Wang wrote:
>>
>>> I am writing my journal article using Lucida. The following code didn't
>>> work:
>>>
>>> \usetypescriptfile[type-buy]

>>> \usetypescript[lucida][texnansi]
>>> \setupbodyfont[lucida,12pt]

>>> \starttext $\Delta$\stoptext
>
> If I change
>         \definefontsynonym [MathRoman]     [LucidaBright]
> into
>     \definefontsynonym [MathRoman]     [LucidaNewMath-Roman] % LucidaBright
>
> it starts working, but probably break other things (would need a bit
> more extensive tests).
>
> Mojca

and it seems that *exactly that* change breaks it.

To start with, it's not only percentage sign. There are more. You
could start with constructions like
    \definemathsymbol [percent]  [nothing] [tf] [37]
in math-lbr.mkii. That works, but I'm not yet sure how to redefine the
character itself since the following doesn't work:
    \definemathcharacter [37]  [nothing] [tf] [37]

One needs to test

\usetypescript[lucida][ec]
\usetypescript[modern][ec]
\showfont[hlcrm]
\showfont[rm-lmr12]

and "redefine"/reassign all characters that are different than in LM.
An alternative is to change the font back to LucidaBright and redefine
all characters that are different there.

Mojca