oj suddenly stopped compiling programs

[comparim]

System: Moodle 1.9.9+ (Build: 20101020)
Ubuntu hardy

We have been using OJ this semester, but a couple of minutes ago,
student posted that their assignments are not being compiled.

I logged in to the ubuntu, and called moodles cron.php manually by
hand, but nothing changes...

What to do next?

Thx...

[Zhigang Sun]

check the log of php (default to /var/log/syslog)

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[Oguz Altun]

Thanks,
It was due to a change in the settings.php
/var/log/syslog is a good hint for future problems..