It's too weird. I'm on Windows 7 Ultimate, 64 bit version, I've tried everything I could imagine about these textboxes, but still no crush.
Two of my friends tried on Windows 8.1 Pro x64, still no crush.
Two of my friends tried on Windows 8.1 Pro x64, still no crush.
One commonality seemed to be Windows 7 Home Premium SP1, but I see someone else was using Windows 8 and reproduced it. Hmm…