Hello,

I use ipython --pylab for plotting a graph (like plot(rand(5))) and I add a label: xlabel(r"$\heta$")
But, oh, I made a mistake! I forget the t in the word \theta!
Bad luck, the pylab window is now unresponsive...

The problem is not the error, but the fact that the figure is now unresponsive and needs to be made entirely again. Expected behavior: interactive IPython/pylab should still be responsive after this error. The error is the following.

In [8]: Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1473, in __call__
    return self.func(*args)
(...)
  File "/usr/lib/pymodules/python2.7/matplotlib/mathtext.py", line 2345, in parse   
    str(err)]))
ValueError:
\heta
^
Unknown symbol: \heta (at char 0), (line:1, col:1)

• Debian distribution, with the following details:
  {'commit_hash': '',
  'commit_source': '(none found)',
  'default_encoding': 'UTF-8',
  'ipython_path': '/usr/lib/python2.7/dist-packages/IPython',
  'ipython_version': '0.13.2',
  'os_name': 'posix',
  'platform': 'Linux-3.2.0-2-amd64-x86_64-with-debian-wheezy-sid',
  'sys_executable': '/usr/bin/python',
  'sys_platform': 'linux2',
  'sys_version': '2.7.5+ (default, Jun 2 2013, 13:26:34) \n[GCC 4.7.3]'}

Best regards,
Olivier