» Thu Jun 21, 2012 3:37 pm
Sorry for the many edits to this post, I had difficulties in following the question.
No, just checking it is not enough, You have to manually set it as active. Before pressing "Ok", make sure that its status is "active".
But, if you simply press "set active" on your plugin, it should automatically be also checked for loading, and the CK will find the masters on it's own. You can actually see them listed in the right hand window.
The key point is, that if no file is marked as active, the CK will assume that you want to create a totally new plugin having as its masters whatever .esm files you have checked for loading. And if I recall correctly, any data in the selected .esp files will be the default for your new plugin, if you choose to edit the same records. Haven't really checked all that thoroughly with the current CK, though.
I am pretty sure there should be instruction for this in some wiki somewhere.