BuddyPress.org

Thanks for testing.

Did you install in plugins or mu-plugins?

Did you activate the plugin?

What version does it say it is?

9 hours ago I uploaded beta Version: 1.9.2

Same download URL:

http://www.642weather.com/weather/scripts/si-captcha-for-wordpress1.9-beta.zip

It had a fix for changing settings on WPMU forced activation installs.

Make sure the plugin is newest version or it may contain wpmu related bugs.

Mike