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It just complains about some obscure error!

The error code indicates the kind of error in some degree. There are comments inside wp-scorerender.php indicating what kind of error it is. If you can't make any heads and tails out of PHP code, feel free to contact the author.

Why music score fragments are not rendered at all?

• Check if the beginning tag and ending tag of your music score fragment are correct.
• It will only be rendered if logged in user has unfiltered_html capability, i.e. the user has Administrator or Editor role in WordPress. User can ask blog admin to boost their capabilities if needed.
• Some programs required for certain notation may be not working or missing.

Is any ABC notation compatible program also supported?

Since 0.2, abcm2ps will be the only one supported. This is a design decision. If you REALLY want to use other similar programs, you are on your own, though modifying the code to support others is not very hard. Take a look at is_notation_usable() method in notation/abc.php.

I want to remove some specific cached image and re-render, but how can I determine which is which?

Right now this is still impossible. Management of cache is planned in future, but can't say when it would be finished.

How to debug my fragment when posting?

Simply answer: don't do that if possible. The best way is render it privately in your computer first, then post the content, rather than needlessly spending lots of time on trial and error. Long answer: There is no easy method for debugging a fragment yet. If there is no choice but perform trial and error, please search for this line in wp-scorerender.php:

    define (DEBUG, FALSE);

Change FALSE to TRUE, then resubmit the content again. It has 2 purposes:

1. Erraneous fragments are not deleted from server temp folder, and you can try manually rendering the fragment using command line to see what's wrong.
2. Full command line for rendering is now shown on blog, so that you can check out if command line argument is wrong.

How can I install Philip's Music Writer?

Only by downloading source from its official website and compile the program yourself. The author failed to notice any binary package for Windows or Linux as of Feb 2010, except an outdated RPM package for Mandriva Linux.

Please refer to the documents inside PMW tarball on how to compile its source code.

I discovered a bug. How can I notify the author?

You can either submit bug report to Googlecode or contact the author.