Plug-in GUI issues in Player

[sunmachine]

Steps to reproduce:

1. Drag the Ultra Analog VST to Slot 1.
2. Drag another Ultra Analog VST to Slot 2.
3. Drag yet another Ultra Analog VST again to Slot 1.


Then after closing and re-opening CopperPlug it looked like this:

[CopperPhil]

Ha ha! Very interesting! Thanks a lot for this report, it promises a lot of fun in debugging