Can Only Activate One Plugin At A Time In Network Dashboard

Hello,

On a WP 4.1.1 multisite network, the bulk plugin activation has ceased working. Only one plugin at a time will activate. Bulk activation fails. http://blogcrop.com

WPMUDEV dashboard admin access has been granted to the site and Haong is currently working on the same network to resolve this thread:

https://premium.wpmudev.org/forums/topic/how-to-flush-rewrite-rules-for-all-sites-on-multisite-network#post-859203

Any help will be appreciated.

Thanks