In the latest version of refinedstorage, there is a texture flickering when you have a whole stack of items in the Soderer. After it processed one of the stack the texure changes very fast to off and then to on [green -> red -> green]. This causes also chunk updates.

• Version: 0.6.14
• Optifine installed
• Forge Mod Loader version: 12.16.1.1907

Fixed in 0.6.15 / 0.7.5. Thanks for reporting

I've noticed this too, will try to push a fix tomorrow for both 1.9 and 1.9.4.