Dear Philip,
[I]f you find a delay of time, run
fc-cache -v.
If messages
invalid cache file: ...
are shown, run
fc-cache -v
once more.
May I ask if, since this discussion last took place
(September 2016) there has been any progress in
resolving the underlying problem ?
There has been no progress in that.
I think that probably a cache file to be renamed is not closed
when requested from the XeTeX itself, thus it cannot
be renamed on Windows.
Best,
Akira
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