I can’t imagine this isn’t a bug: I make changes to the plug-in settings (in the master section), switch to a different plug-in, switch back, and all the settings are changed back!
Please see screen recording linked here (because .mov files are not allowed as attachments?!?):
https://dl.dropboxusercontent.com/u/5383787/WL%20StereoTools.mov
WL 8.0.5, Mac OS 10.10.5