I copied my database folder to a new computer with debian wheezy and mnemosyne 
2.0-RC1 (No problems with the old computer). Now when I try to view a latex 
card it gives me this error (just for the first times, after I preview the card 
for 1 or 2 times the error disappear and the card get rendered, I can't do this 
for all the possible cards though):

Uncaught exception!
Traceback (innermost last):
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/pyqt_ui/browse_cards_dlg.py", line 
449, in menu_preview
    PreviewCardsDlg(self.component_manager, cards, tag_text, self)
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/pyqt_ui/preview_cards_dlg.py", line 
42, in __init__
    self.update_dialog()
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/pyqt_ui/preview_cards_dlg.py", line 
72, in update_dialog
    self.set_answer(card.answer())
  File "/usr/lib/python2.7/dist-packages/mnemosyne/libmnemosyne/card.py", line 
96, in answer
    (self, render_chain, **render_args)
  File "/usr/lib/python2.7/dist-packages/mnemosyne/libmnemosyne/card_type.py", 
line 74, in render_answer
    render_answer(card, **render_args)
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/libmnemosyne/render_chain.py", line 
142, in render_answer
    return self._render(card, fact_keys, decorators, **render_args)
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/libmnemosyne/render_chain.py", line 
153, in _render
    card, fact_key, **render_args)
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/libmnemosyne/filters/latex.py", 
line 102, in run
    img_tag = self.process_latex_img_tag("$" + match.group(1) + "$")
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/libmnemosyne/filters/latex.py", 
line 82, in process_latex_img_tag
    img_file = self.create_latex_img_file(latex_command)
  File 
"/usr/lib/python2.7/dist-packages/mnemosyne/libmnemosyne/filters/latex.py", 
line 73, in create_latex_img_file
    shutil.copy("tmp1.png", img_name)
  File "/usr/lib/python2.7/shutil.py", line 120, in copy
    copymode(src, dst)
  File "/usr/lib/python2.7/shutil.py", line 91, in copymode
    os.chmod(dst, mode)
 OSError: [Errno 1] Operation not permitted: 
'25a4ba2a7730a9ceb14f5cb82f88f73c.png'

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