Ok, I'm with 2.2.1, but I get the same error:

@debian:~$ mnemosyne
This is dvipng 1.14 Copyright 2002-2010 Jan-Ake Larsson
[1] 
An unexpected error has occurred.
Please forward the following info to the developers:

Traceback (innermost last):
  File "/usr/local/bin/mnemosyne", line 5, in <module>
    pkg_resources.run_script('Mnemosyne==2.2.1', 'mnemosyne')
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 499, in 
run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1235, in 
run_script
    execfile(script_filename, namespace, namespace)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/EGG-INFO/scripts/mnemosyne",
 line 155, in <module>
    debug_file=options.debug_file)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/__init__.py",
 line 202, in initialise
    self.main_widget().activate()
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/pyqt_ui/main_wdgt.py",
 line 51, in activate
    self.start_review()
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/component.py",
 line 120, in start_review
    self.review_controller().reset()
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
 line 62, in reset
    self.show_new_question()
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
 line 132, in show_new_question
    self.update_dialog()
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
 line 204, in update_dialog
    self.update_qa_area(redraw_all)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
 line 237, in update_qa_area
    self.render_chain, no_side_effects=True))
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/card.py",
 line 96, in answer
    (self, render_chain, **render_args)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/card_type.py",
 line 75, in render_answer
    render_answer(card, **render_args)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/render_chain.py",
 line 142, in render_answer
    return self._render(card, fact_keys, decorators, **render_args)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/render_chain.py",
 line 153, in _render
    card, fact_key, **render_args)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/filters/latex.py",
 line 107, in run
    img_tag = self.process_latex_img_tag("$" + match.group(1) + "$")
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/filters/latex.py",
 line 87, in process_latex_img_tag
    img_file = self.create_latex_img_file(latex_command)
  File 
"/usr/local/lib/python2.7/dist-packages/Mnemosyne-2.2.1-py2.7.egg/mnemosyne/libmnemosyne/filters/latex.py",
 line 78, 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: 
'610f5cf4dcbf0cc6d653749b3c15c722.png'


On Thursday, April 25, 2013 1:53:41 PM UTC+2, Peter Bienstman wrote:
> You are using a really ancient version.  Please upgrade to 2.2.1.
> 
> 
> 
> Cheers, 
> 
> 
> 
> Peter 
> 
> 
> [email protected] wrote:
> 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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