System Information
Windows 8.1
Geforce GTX 760
(system-info.txt :

)

Blender Version
Broken: 2.7.5 rc1 (bff8b5d) and 2.7.5 rc2 (c85a58a). Both from Blender.org
Worked: 2.7.3 (from Blender.org too)

Description of error
Severe memory leak filling the entire RAM and freezing the entire system. Windows stops Blender after a while (with a warning saying that there is not enough RAM available).

You can clearly see the moment when it started. I don't know when it started to go down. It may be when Windows stopped Blender. I pressed "Print Screen" before this moment but it apparently took a long time to be done.

I attached a .blend (really close to default) but I don't think it changes anything. I won't test with another file right now because it's quite long (and after several tries I had to restart my computer, it had become slow)

How to reproduce the error

1. Open Blender 2.7.5
2. Start dragging the properties panel opening widget (the +)