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Changes between Initial Version and Version 1 of Ticket #16617, comment 5

initial	v1
1	1	Here's the problem:
2	2
3		The function `get_role()` uses the global `$wp_roles`, which is instantiated the first time that ~~`get_role()` is~~ called. At instantiation, it loads the `wp_user_roles` option and stores it as `$wp_roles->roles`.
	3	The function `get_role()` uses the global `$wp_roles`, which is instantiated the first time that one of the capability functions are called. At instantiation, it loads the `wp_user_roles` option and stores it as `$wp_roles->roles`.
4	4
5	5	Now, whenever you use $wp_roles::add_cap() (as the procedural plugin does), it simply adds the capability to `$wp_roles->roles`, and then does `update_option()` to store it in the database. If, in the mean time, something else has updated the `wp_user_roles` option independently (which is what the OO plugin does, with it's own instatiation of the WP_roles class), then $wp_roles has no knowledge of this and simply overwrites those changes. Hence the capability added by the OO plugin is overwritten.