Hallo,
I have an old project in which I've added cgdevTools components.
ThemeSwitcher was working with FireFox but not with IE-11.
I found the problem in IWServerController.dfm.
In this older project two settings crashed the ThemeSwitcher:
1.) IECompatibilityMode = IE=8
2.) HTMLHeaders.Strings = <meta http-equiv="X-UA-Compatible" content="IE=8"/>
I had to change it to IE=9 or newer and ThemeSwitcher was runing.
Maybe someone have the same problem ...
Kind regards.