[NTG-context] Upgrade to 2015.11.19 breaks OTF reader?

[Thangalin]

Hi.

Installation: http://wiki.contextgarden.net/Ubuntu#With_ConTeXt_Standalone_.E2.80.93_should_work_with_all_Ubuntu_versions

Font (OTF): https://www.google.com/fonts/specimen/Source+Sans+Pro

= MWE (test.tex) =
\definefont[VersionFont][name:sourcesanspro]

\starttext
  \VersionFont
  Hello, World
\stoptext
= EOF =

= LOG FILE (test.log) =
system          > callbacks > not registering frozen 'find_format_file'

open source     > 1 > 1 >
/usr/local/context/tex/texmf-context/tex/context/base/cont-yes.mkiv

ConTeXt  ver: 2015.11.19 19:13 MKIV beta  fmt: 2015.12.2  int: english/english

system          > 'cont-new.mkiv' loaded
open source     > 2 > 2 >
/usr/local/context/tex/texmf-context/tex/context/base/cont-new.mkiv
close source    > 2 > 2 >
/usr/local/context/tex/texmf-context/tex/context/base/cont-new.mkiv
system          > files > jobname 'test', input './test', result 'test'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > 2 > 3 > /tmp/test.tex
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
fonts           > defining > source file 'SourceSansPro-Regular.ttf'
is not found
backend         > xmp > using file
'/usr/local/context/tex/texmf-context/tex/context/base/lpdf-pdx.xml'
pages           > flushing realpage 1, userpage 1
close source    > 2 > 3 > /tmp/test.tex
close source    > 1 > 3 >
/usr/local/context/tex/texmf-context/tex/context/base/cont-yes.mkiv

!LuaTeX error: cannot find OpenType font file for reading ()
 ==> Fatal error occurred, no output PDF file produced!
= EOF =

= MTXRUN =
$ mtxrun --script fonts --list -all sourcesanspro

sourcesanspro   sourcesansprosemiboldit
/usr/local/share/fonts/google/s/SourceSansPro-SemiboldItalic.ttf
= EOT =

I also noticed that there's a luatex-cache directory in $HOME, which
is strongly undesirable. (It should be $HOME/.luatex-cache, or reside
under /var/.)

Any ideas on why the font cannot be found? This was working until I
upgraded ConTeXt last night.

Thank you.