Hi, Tomas,
Usually, the "Bad magic number" is caused by wrong python version when 
running .pyc file (the .pyc must have been compiled using a different 
version of python than the one in PyMOL 1.3, which is python 2.5.4). 
Maybe you have also noticed on the first line of the CASTpyMOL webpage :

"To use CASTpyMOL version 2, you must be using PyMOL version 0.99 "

pymol 0.99 and pymol 1.3 uses different versions of python.

Maybe you should contact the CASTpyMOL people to get a .py file so you 
can try them with your pymol 1.3, or ask them to compile a .pyc using 
python 2.5.4 for you. Or install pymol 0.99 in parallel to you pymol 1.3.

good luck!
hongbo

On 03/22/2011 11:03 AM, Tomáš Kučera wrote:
> Hello pymol users,
>
> I try to install this castp plugin:
> http://sts.bioengr.uic.edu/castp/pymol.php
> ->  http://sts.bioengr.uic.edu/castp/infoPages/CASTpyMOL_v2.pyc
>
> I have pymol 1.3 (windows7 64bit)
>
> and I got:
>
> ImportError: Bad magic number in C:\Program Files
> (x86)\PyMOL\PyMOL/modules\pmg_tk\startup\CASTpyMOL_v2.pyc
> Error: unable to initialize plugin 'CASTpyMOL_v2'.
>
> Does anyone have any idea how to fix this issue?
>
> Thanks, Tomas
>

-- 
Hongbo ZHU
Postdoctoral Researcher
Structural Bioinformatics

Technische Universität Dresden
Biotechnology Center
Tatzberg 47/49
01307 Dresden, Germany

Tel: +49 (0) 351 463-40083
Fax: +49 (0) 351 463-40087
E-Mail:  hongbo.zhu at biotec
Webpage: www.biotec.tu-dresden.de

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