Enabling Quote creates Errors

Hello,
Just installed you module on top of Michelle's great Advanced Forum Module on my local development server. Everything went smoothly as far as the install goes, but when I try to reply to a post, I get this error at the top of the page.

"warning: Invalid argument supplied for foreach() in /Applications/MAMP/htdocs/mysite/modules/node/node.module on line 521.
warning: implode() [function.implode]: Invalid arguments passed in /Applications/MAMP/htdocs/mysite/modules/node/node.module on line 525.
user warning: 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 query: SELECT n.nid, n.vid, n.type, n.status, n.created, n.changed, n.comment, n.promote, n.sticky, r.timestamp AS revision_timestamp, r.title, r.body, r.teaser, r.log, r.format, u.uid, u.name, u.picture, u.data FROM node n INNER JOIN users u ON u.uid = n.uid INNER JOIN node_revisions r ON r.vid = n.vid WHERE in /Applications/MAMP/htdocs/mysite/includes/database.mysql.inc on line 172."

The [function implode] link takes me to an error message "The comment you are replying to does not exist."

I have the quote module installed as per your instructions with the quote filter after the URL and HTML filter but before the Line Break Converter, and the the node type association set in the Quote settings page.

I have Flat Comments enabled in my install to link comments in my forums, but other than than, I am not sure what could be interfering with the Quote module. Disabling Quote removes the problem.

I've tried both the standard and dev. version of Quote, same problem.

Any ideas where to start on this one?