WPMU Dev Conflict With WP Polls

I am having an issue with the WP Polls plugin. For some users, when they are creating a new poll, they click on the add answer button and it does nothing.

I checked the log console and the error is:

Uncaught ReferenceError: wpmUi is not defined - admin.php?page=wp-polls%2Fpolls-add.php:915

I was told this is due to something with WPMU Dev. Can someone help me troubleshoot this issue. It only happens with certain users and not all users get that error.