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|  |  | DEVONthink behaves irrationally

No software on this planet is bug-free, and if an application behaves irrationally there is a good chance that your have just found a bug. But there could also be another cause: The application package could have become damaged during an update or through a bug in a totally unrelated piece of software on your computer. Strange Application Behavior If you see odd behavior like menus disappearing or silently refusing to do anything, windows showing graphical artifacts, or applications not opening at all or opening with strange error messages, the first step is to reboot the machine. If that doesn't resolve the issue, try deleting DEVONthink's preferences files. Please quit DEVONthink, launch Terminal app, and enter this:
Terminal: `$ defaults delete com.devon-technologies.think3`
Note: Rebooting a machine can often cure a host of issues, closing down rogue processes, releasing memory, etc. We suggest rebooting your devices at least once a week, just to mitigate potential issues.
Strange behavior related to documents If the strange behavior only happens with a particular document, it is possible the document is damaged, was created in a very old or extremely new file format that is no longer or not yet properly supported, or uses a damaged or malfunctioning Quick Look plugin. Please file a support ticket and attach the document in question, packaged as a .zip archive, so that we check to see if the problem lies with DEVONthink or if it the file itself.