Nothing is showing in the logs for this particular bug, even with LogLevel debug switched on.
I am testing it on two different WPMU installs. One uses sub-directories and another uses sub-domains.
On the sub-domain install, the votes are accepted but on page refresh, there is no evidence of a vote having been made and I appear to be able to vote again. However, the stats in the Dashboard only record the first vote.
When I vote on comments on a sub-domain WPMU blog, I also get the following error in the logs:
[error] [client x.x.x.x] WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 for query select * from wp_12_gdsr_data_article WHERE post_id = made by GDStarRating->vote_comment, GDSRDatabase->get_post_data, referer: http://test.jiscpress.org/2009/07/28/3-jisc-vision-mission-and-objectives/
I am using:
mysql Ver 14.12 Distrib 5.0.75, for debian-linux-gnu (i486) using readline 5.2
PHP 5.2.6-3ubuntu4.1 with Suhosin-Patch 0.9.6.2 (cli) (built: Apr 23 2009 14:35:05)
Copyright (c) 1997-2008 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies
with eAccelerator v0.9.5.3, Copyright (c) 2004-2006 eAccelerator, by eAccelerator
On the sub-directory install, I get the spinning icon which does not stop until a page refresh. I do not experience this on a sub-domain install. I am using:
mysql Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (x86_64) using readline 5.2
PHP 5.2.4-2ubuntu5.7 with Suhosin-Patch 0.9.6.2 (cli) (built: Aug 21 2009 22:17:39)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies