**System Information**
Win64, Intel third-gen i7 CPU, ATI HD7xxx GPU, 16 gigs RAM
**Blender Version**
Broken: Blender hash 64e4f99
Worked: Blender hash 68797ed
**Short description of error**
Cycles is suddenly dropping a ton of samples when rendering glass, meaning the result is looking much darker and incorrect.
**Exact steps for others to reproduce the error**
Open the .blend and render the scene, first using the refraction/transparent/glossy method of building a glass material and second using the stock glass shader. The bug is especially visible with the stock glass shader as seen here.
{F243965}
**.blend**
{F243964}