Multi-DB and Twitter Tools - writing to the correct database

I'm trying to configure Alex King's Twitter Tools plugin on my WMPU install, where I have multi-DB also installed.

- The 'wp_xx_ak_twitter' table (where xx is the blog number) gets created correctly in the correct database. I verified this in phpMyAdmin.
- BUT the twitter posts are not being written to the database at all.
- I tried it on a both a regular DB blog and a VIP DB blog.
- I can manually copy each tweet into the database via phpMyAdmin, but that's no fun

To troubleshoot, I tried the plugin on my other WPMU install (no multi-db), and it works fine.

Has anyone else seen this issue? I imagine it's a simple change to the twitter-tools.php file to get it to write to the correct database.