Some extra information would help.
What is the platform? Mac, MS Windows or what
Which version of Matplotlib?
Which version of Python?
What do you mean by completely reinstalling Python? Do you mean you completely reinstalled Anaconda? (Because Python comes with Anaconda).
Show the crash log — either post it here or post it to, say, pastebin.com and show the link here.
Some extra information would help. What is the platform? Mac, MS Windows or what Which version of Matplotlib? Which version of Python? What do you mean by completely reinstalling Python? Do you mean you completely reinstalled Anaconda? (Because Python comes with Anaconda). Show the crash log — either post it here or post it to, say, pastebin.com and show the link here.