**System Information**
Windows 10 64-bit, Nvidia gtx 570 (render), Nvidia gt 610 (display)
**Blender Version**
Broken: 2.77a, c0943ba (latest 64-bit build)
Worked: -
**Short description of error**
In Cycles, when the 'Viewport Alpha' in the material's 'Settings' panel is set to 'Alpha Blend', 'Alpha Sort' or 'Alpha Clip' //and// the material has a 'Transparent' node connected //and// 'Transparency' is checked in the Object's 'Display' tab //and// the viewport shading is 'Material', the selected object appears triangulated.
Unchecking the 'Transparency' setting on the Object's 'Display' tab returns the mesh back to normal.
**Exact steps for others to reproduce the error**
1. Open {F304770}
2. Toggle 'Transparency' on and off in the Object's 'Display' panel.