thumbnailing in Mediawiki families does not work

[Tristanv]

Hi,

Version: ImageMagick 6.8.7-0
Delegates: bzlib djvu fftw fontconfig freetype gslib jng jpeg lcms ltdl lzma png ps png tiff webp x xml zlib
PHP 5.3.26
OS X Server 10.8.5

Mediawiki 1.21

We upgrade from Mediawiki 1.16 to 1.21
6 Wikis, 5 languageWikis, 1 commonsWiki

The only issue is the following.
Uploading an image to commonsWiki and showing the image in the languageWikis works without any problem.
But thumbnailing leads to the following error message

convert: no decode delegate for this image format
`/var/tmp/magick-6505R3QorkgCQavW' @ error/constitute.c/ReadImage/550.
convert: no images defined `/var/tmp//transform_853b47e1b746-1.jpg' @
error/convert.c/ConvertImageCommand/3078

If an image is uploaded to an languageWiki and be thumbnailed there: works!

When deactiving ImageMagick the error remains and the following message appears
Error creating thumbnail: File seems to be missing:

But the image in original size is being displayed correctly.

Any ideas
Thanks in advance
Tristan

[fmw42]

I know nothing about MediaWiki, but just try providing the full path to IM and to your images and see if that helps. Typical paths to IM are usually either /usr/bin/convert or /usr/local/bin/convert.

You can try

type -a

to see if it will tell you where IM resides.