Plugin conflicts!

As I’ve tried to network-activate several WPMUD plugins, I’m being repeatedly left with only a blank screen – can’t get back to the list of plugins in the Admin console. So, I have to then go manually delete the plugin, and my access to admin panel is restored. This has happened with several plugins …

It has even happened on Pro Sites!

Can someone please assist me in figuring out why, AND how to troubleshoot this?

Thank you.