[Mediawiki-l] "Show changes" button gives blank page

[Laszlo Gal]

When I edit a page and try to clkic on "Show Changes" button at the
bottom, it gives me a blank screen instead of showing the diff.

My install's version is:

$ svn info
Path: .
URL: http://svn.wikimedia.org/svnroot/mediawiki/trunk/phase3
Repository Root: http://svn.wikimedia.org/svnroot/mediawiki
Repository UUID: dd0e9695-b195-4be7-bd10-2dea1a65a6b6
Revision: 19794
Node Kind: directory
Schedule: normal
Last Changed Author: leon
Last Changed Rev: 19794
Last Changed Date: 2007-02-05 22:08:27 +0100 (Mon, 05 Feb 2007)
Properties Last Updated: 2007-01-29 22:58:47 +0100 (Mon, 29 Jan 2007)

Any advice how to fix this?

Thanks,
Laszlo