Deactivate update function from inside controlpanel
The experimental function to update ISPConfig from within the controlpanel has been deactivated as it can cause broken updates. The problem seems to be related to a race condition with other cronjobs or a similar problem, it works many times and the fails once and works again the next time.
The normal shell based update function (ispconfig_update.sh) is not affected by this problem.
Please see release notes for update instructions and notes for a specific release.