Plugin not working with Multi-DB

I installed a plugin (rootsPersona) and it's having database issues. I can see what the issue is but not sure how to address the blog databases correctly. Here's how it looks:

1. I'm using Multi-DB with 256 databases.

2. The blog I'm testing with has its tables in the database mysite_blogs_ec

3. The tables are named like wp_3_comments, wp_3_options etc

4. The error is Table 'mysite_blogs.wp_3_rp_indi' doesn't exist

I don't know a whole lot about WPMU specifically, but it seems that the plugin has detected that I'm using WPMU but is not picking up the multiple databases (i.e. it is expecting a standard WPMU configuration)?

Gary