Many issues with system installation can be fixed by resetting Mathematica‘s preferences. Starting the product with cleared preferences returns it to its default configuration by deleting and recreating internal files located in the Base Directory and the User Base Directory. You can find their locations on your computer by evaluating $BaseDirectory and $UserBaseDirectory in a Wolfram notebook.
If you have saved anything to these directories, please back them up before performing a clean start. If you have edited any init.m files, they would be located in these directories.
After performing the clean start, Mathematica may need to be activated again. You can access your activation information through the Wolfram User Portal.


Windows

To perform a clean start on Windows, start Mathematica while holding down the Ctrl and Shift keys. Keep the keys held down until the Mathematica screen appears. If this does not address the issue, you can perform a clean start manually by deleting the Base Directory and User Base Directory on the computer.

On Windows Vista, 7, 8, and 8.1, by default these directories are located at:

  • C:\ProgramData\Mathematica
  • C:\Users\<user>\AppData\Roaming\Mathematica

where <user> is your username on the computer.

These files may be hidden on your computer. You may need to enable your account to see hidden files.

Mac

To perform a clean start on a Mac, start Mathematica while holding down the Option and Shift keys. Keep the keys held down until one the Mathematica screen appears. If this does not address the issue, you can perform a clean start manually by deleting the Base Directory and User Base Directory on the computer. By default these are located at:

  • /Library/Mathematica
  • ~/Library/Mathematica

These files may be hidden on your computer. To navigate to a hidden folder, open the Finder application. Press Command + Shift + G to open a file search dialog and enter “~/Library/Mathematica/”. Finder opens the hidden folder.

Linux

To perform a clean start on Linux, start Mathematica by running the following in your terminal:

mathematica -cleanstart

If this does not address the issue, you can perform a clean start manually by deleting the Base Directory and User Base Directory on the computer. By default these are located at:

  • /usr/share/Mathematica
  • ~/.Mathematica



If this does not solve the problem, please contact Wolfram Customer Support for assistance.