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I have recently (October) moved to a Mountain Lion-based laptop from Snow Leopard. I find that if I have not rebooted within the last week or so, XeLaTeX will just die in the middle of a run. The PDF output is empty. If I give a full reboot to my laptop, it will be just fine for the next week or so. Has anyone else had this problem and if so, is there a fix?

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What kind of error does xelatex throw out? Care to elaborate on what "just die" means? – Werner Feb 6 '13 at 4:31
XeTeX uses a font cache and if it wasn't build before the compilation stops for a moment to build it. If you have a lot of fonts, it can take more than a minute! However, the log file should say more ... – Herbert Feb 6 '13 at 7:08
Clarification: It just dies. The output stops and returns me to a command prompt. There is no error message. The log abruptly stops where XeLaTeX decided to stop. You can insert the whole dead parrot sketch here. I mean it's dead. Were there an error message or something like that, it'd be easier to diagnose, so that's a huge piece of this puzzle. – James Howard Feb 6 '13 at 13:15

I'm pretty confident this is not a general problem: I very rarely reboot my Mac (running 10.8), and XeTeX works fine. I guess the most obvious suspect would be as commented something to do with the system-dependent font hooks in XeTeX: that is likely to need expertise outside of the TeX area to solve so would be off-topic.

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Test XeTeX installation at Terminal/commandline window with xetex opentype-info to get opentype-info.pdf on TeXLive distro – texenthusiast Aug 7 '13 at 8:05

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