Thread:Project:Support desk/Image thumbnail creation broken

I've noticed that no thumbnails have been made for any uploads made in the past few months.

The site is www.peckhamvision.org and runs: MediaWiki: 1.8.2 PHP: 5.2.17 (cgi) MySQL: 4.1.22-standard

All that is shown on the page instead of the thumbnail is some text "Error creating thumbnail:". The MW log has the following lines:

img_width match: 300 makeImageLinkObj: '300'x'', "architects meet the CoDesigners" reallyRenderThumb: running ImageMagick: -quality 80 -background white -size 300  -coalesce  -thumbnail  -depth 8  2>&1 wfShellExec: -quality 80 -background white -size 300  -coalesce  -thumbnail  -depth 8  2>&1 thumbnail failed on nativespace-mercury.ns-mercury.com: error 1 "" from " -quality 80 -background white -size 300 -coalesce  -thumbnail  -depth 8  2>&1"

Nothing has changed in the LocalSettings.php file to stop this from working and the server is running ImageMagick 6 in the correct location "/usr/bin/convert".

I have seen a few other posts that recommend increasing the $wgMaxShellMemory but even after doing that nothing changes.

Can anyone think of anything else?

thanks