Here's a minimal example for Hans & Taco:
\usetypescriptfile[type-gyr]
\usetypescript[palatino] \setupbodyfont[palatino,12pt] \starttext ab\ccaron \stoptext
Both LuaTeX and XeTeX fail (two different "bugs"), and I have no idea why that happens. (Why are the map files loaded without calling the [ec] encoding in XeTeX? And what's wrong with LuaTeX reading the map/encoding files?)
In case that it helps - here's the log:
fonts : using map file: original-ams-base
{/Users/mojca/context/tex/texmf-context/fonts/map/pdftex/context/original-ams-base.map}
fonts : using map file: original-ams-euler
{/Users/mojca/context/tex/texmf-context/fonts/map/pdftex/context/original-ams-euler.map}
fonts : using map file: original-public-lm
{/Users/mojca/context/tex/texmf-context/fonts/map/pdftex/context/original-public-lm.map}
fonts : using map file: qpl-ec
{/Users/mojca/context/tex/texmf/fonts/map/dvips/tex-gyre/qpl-ec.map}
fonts : using map file: original-youngryu-px
{/Users/mojca/context/tex/texmf-context/fonts/map/pdftex/context/original-youngryu-px.map}
[1.1]
systems : end file a at line 9
){/Users/mojca/context/tex/texmf/fonts/enc/dvips/tex-gyre/q-ec.enc}
! Emergency stop.
<*> a.tex
fclose: Bad file descriptor
fclose: Bad file descriptor
! ==> Fatal error occurred, no output PDF file produced!
----------------------
The output of XeTeX is to be expected, but I don't know why the map
file is loaded at all.
) (/Users/mojca/context/tex/texmf-context/tex/context/base/type-tmf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-siz.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-otf.tex
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-tmf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-siz.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-otf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-xtx.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-gyr.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-tmf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-siz.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-otf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-xtx.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-gyr.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-tmf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-siz.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-otf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-xtx.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-gyr.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-tmf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-siz.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-otf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-xtx.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-gyr.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-tmf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-siz.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-otf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-xtx.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-gyr.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-tmf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-siz.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-otf.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-xtx.tex)
(/Users/mojca/context/tex/texmf-context/tex/context/base/type-gyr.tex))
(./a.tuo) (./a.tuo) (./a.tuo) (./a.tuo) (./a.tuo) (./a.tuo) (./a.tuo) (./a.tuo)
(./a.tuo) (./a.tuo) (./a.tuo) (./a.tuo)
systems : begin file a at line 4
fonts : resetting map file list
fonts : using map file: original-base
fonts : using map file: lm-math
fonts : using map file: lm-rm
fonts : using map file: texnansi-base
fonts : using map file: ec-base
fonts : using map file: qx-base
fonts : using map file: t5-base
fonts : using map file: 8r-base
fonts : using map file: original-ams-base
fonts : using map file: original-ams-euler
fonts : using map file: original-public-lm
fonts : using map file: qpl-ec
fonts : using map file: original-youngryu-px
(/Users/mojca/context/tex/texmf-context/tex/context/base/sort-def.tex
(/Users/mojca/context/tex/texmf-context/tex/context/base/sort-def.mkii))
(/Users/mojca/context/tex/texmf-context/tex/context/base/sort-lan.tex
loading : Context Sorting Macros (languages)
(/Users/mojca/context/tex/texmf-context/tex/context/base/sort-lan.mkii))
[1.1]
systems : end file a at line 9
)
stdin -> a.pdf
[1
** WARNING ** This .map file looks like a dvips format fontmap file.
** WARNING ** -- Current input buffer is: ec-qplr
TeXGyrePagella-Regular "encqec ReEncodeFont"