On 17-6-2010 11:54, Oliver Buerschaper wrote:
Dear wise guys,

the other day I found myself caught in a trap that might be a frequent source 
of puzzlement for the casual ConTeXt user :-)

I had replaced an OpenType font in the usual OS directory by a new version. 
Typesetting documents using that font produced surprising results... the PDF 
files were merrily messed up. I reckon I didn't pay attention to the interplay 
between font files and the LuaTeX cache... apparently ConTeXt was using the 
outdated font cache data together with the new font file since a few days later 
the problem was resolved once I had to regenerate the cache for other reasons. 
Only then did I notice I had also cured this font problem.

Do you think it would be a good idea to store a checksum of the actual font 
file used while generating the cache?

no, as calculating the checksum is quite slow

normally context will detect a change in filesize so i wonder what went wrong at your end

Hans

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