When I add the dll's from the official Perfion API to DW's bin folder and clik on "Management Center" we get the yellow screen of death (See Attachments)
STEPS:
Install a 8.6.x.x add the offical perfion api dll's to your web bin folder and click on "Management Center"
I tryed with version 8.6.1.0 and version 8.6.1.8
With version 8.5.1.8 you don't have the problem.