I want to activate a plugin for a single sub-site in my mult-site install.
I installed a plugin, however did not network activate.
I then go to my network admin > sites > select the blog i want to add the plugin to > click on the settings tab for that blog > scroll to the bottom of the page to Plugin Override Options > select the check box for the corresponding plugin > save changes
The check box will remain checked, but will not activate the plugin on the individual sub blog as expected.
As a super user I can login into the blog and then go to plugins and manually activate the plugin for the blog...however the wpmudev dashboard plugin is not working as expected.