**System Information**
OS: Mac OSX 10.10.1
Graphics Card: AMD Radeon HD 6970M 2048 MB
AND
OS: Windows 8.1
Graphics Card: Nvidia Geforce GTX570
**Blender Version**
Broken: 2.73
Worked: ?
**Short description of error**
Crash on Render a "Render Layer" with "/" in the name and "Save Buffers" enabled (Cycles)
**Exact steps for others to reproduce the error**
1. Open Blender standard startup file
2. Switch to "Cycles Render"
3. Goto "Render Layers" Tab
4. Change the Render Layer name from eg. "RenderLayer" to "Render/Layer" (slash is the problem!)
4. Goto "Render" Tab
5. Under Performance tick "Save Buffers"
6. Hit F12 (Render) -> Crash