I've noticed when a program is spazzing out that it'll sometimes have a Windows 7 style title bar, and some programs like mIRC even use Windows 7 style windows within them. I took a few screens of it: imgur.com/a/sK5QW Any chance that it's a hidden theme? Would it be possible to force it across everything?
Where do you select it at? The only themes I have are Windows, Windows 10, Flowers, and the high contrast ones.