re: I am getting the white screen of death when I activate connections main plugin on one of my subsites in multisite.
Is is running fine on other subsites? If it is, my first thought is that a theme or plugin installed and that particular subsite is causing a fatal PHP conflict. So, my first suggestion is to deactivate all other plugins on that sub site and then try activating Connections. Does that fix it? If yes, then Connections is having a fatal conflict with one of those deactivated plugins. Activate each one one at a time until you get the white screen. The last plugin activated is the one where the fatal conflict is. Let me know which one. If deactivating all the other plugins didn’t fix the white screen, then temporarily activate one of the default themes and then activate Connections. If that fixes it, then there is a fatal conflict with the theme. Let me know which.
If the above does not resolve the issue, try increasing the memory allocated to PHP.
Also, have you checked the PHP error logs? Perhaps there is something in there that could help narrow the issue down.
Hope that helps! Let me know what you find out.