This appears to be a Catalyst (fglrx) driver bug. Please try removing the driver and using radeon instead.
Alternatively you can try reverting back to the rendering method used in Ubuntu 12.04:
CCSM > OpenGL >
framebuffer_object = OFF
vertex_buffer_object = OFF
always_swap_buffers = OFF
John,
This appears to be a Catalyst (fglrx) driver bug. Please try removing the driver and using radeon instead.
Alternatively you can try reverting back to the rendering method used in Ubuntu 12.04: object = OFF buffer_ object = OFF swap_buffers = OFF
CCSM > OpenGL >
framebuffer_
vertex_
always_