I had that problem also. On this line:
echo '<form action="edit.php?page=yarq.php" method="post">' . "\n";
I removed the action so that I now have:
echo '<form action="" method="post">' . "\n";
Another problem that creeped in around that time is that data for the “source” column disappeared, so I added it back here:
echo '<td>' . $quote->author . '</td>' . "\n";
echo '<td>' . $quote->source . '</td>' . "\n";
(I’ve also enhanced it quite a bit including an “edit” feature and automatically putting in paragraphs and line breaks, but I’ve made it customized for my uses and removed some security so haven’t posted it anywhere. If anyone wants a copy I’d be happy to send my code, with no warranty of course!) 🙂
(Now let’s see if this code posts okay…)
I decided to clean things up a bit and posted a new version at my site:
http://www.movingtofreedom.org/2010/07/11/wordpress-plugin-yarq-v3-yet-another-random-quote/
Also contacted ChristianB about updating the wordpress.org plugin page if possible.