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.

Thanks.