Hi, mu-plugin stands for "must use" plugins not "multi user".
If you swop all instances of
$cimy_uef_plugins_dir == "mu-plugins"
and then "network activate" the plugin from the network admin plugin list, one can achieve similar effect in a the more 'wordpress way. Then folks can then more easily activate and deactivate when testing.
It also allows the possibility of NOT network activating it and having the subsites activate as they wish.
Also suggest take that cimy_uef_mu_activation.php out of the must-use folder. It does not disappear when network deactivating the plugin, leaving those extra menu options, which was somewhat annoying.
Also you may wish to fix warnings when there are no hidden fields:
Warning: in_array() expects parameter 2 to be array, null given in C:\wamp\www\wp\wp-content\plugins\cimy-user-extra-fields\cimy_uef_admin.php on line 1420