I can confirm this issue after upgrading to WordPress 4.7. The plugin was network activated on a multisite running WordPress 4.6 without any issue. After the upgrade it is no longer possible to access wp-admin if yop-poll is activated for the network. The error message is ‘Sorry, you are not allowed to access this page’.
After deleting yop-poll via ftp access is granted again to wp-admin. You can than re-install yop-poll and activate it per site.
I have the same experience as mensmaximus. I have been able to gain access to wp-admin by renaming the YOP Poll plugin directory, essentially disabling Yop Poll. Mensmaximus, were you able to get back to normal after reinstalling Yop Poll?
@lannyca as i wrote you can activate yop-poll per site.
