Have you loaded any plugin variations lately? Some of the ones released to cover the Z+ variations are buggy.

My suggestion is to cut/paste all of the .dll files from your Apo Plugin folder to somewhere else, then open Apo and see if the problem is still there... if not, start adding the .dll files back into the Plugin folder one by one until you get the error again - that will isolate which one is causing the error you are seeing...

T.

Who? Me?