**System Information**
System: Windows 7 64bit
RAM: 4096 MB
renderer: 'GeForce GTX 760/PCIe/SSE2'
vendor: 'NVIDIA Corporation'
version: '4.5.0 NVIDIA 353.30'
**Blender Version**
Broken: blender 2.76.11 (1c4f21f)
Worked: (optional)
**Short description of error**
The lines of the muted compositor node Vector Curves are too thick.
**Exact steps for others to reproduce the error**
Based on a (as simple as possible) attached .blend file with minimum amount of steps
{F283126}