Windows 10 x64
EVGA GeForce GTX 980
Broken: 2.77 hash 22a2853)
**Short description of error**
I rendered a scene once with my GPU, and it worked correctly, however upon trying a re-render with different settings I received the error "CUDA error at cuCtxCreate: Already Mapped"
Changing the device to CPU, rendering, and returning to GPU does not solve it, however re-launching Blender appears to work for one render.
I have installed the Pro Lighting Skies demo add-on and the CubeSter add-on, all other enabled add-ons are included in trunk.
**Exact steps for others to reproduce the error**