Manual talk:Thumb.php

After some changes in MW configuration thumb script refused to work (it worked in the very beginning, I'm sure of that) - I mean, browser waits for its answer for eternity. After I wrote $wgThumbnailScriptPath = "{$wgScriptPath}/thumb.php"; (what has always been true), it generates frames but there are no images inside. What could it mean? MediaWiki 1.13.2, PHP 5.2.9-2 (apache2handler), MySQL 5.0.67-community-nt