Using the OSX version of Stellarium and setting a 4096x2048 landscape sometimes results in a garbled screen. 2048x1024 horizons do not have this issue.
When I clean up some apps on OSX, the problem is over. I have a Macbook Pro 2011 edition running 10.9 Mavericks and 8GB of RAM. Even when Stellarium loaded, there is still unused RAM.
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For textures is critical size of RAM on graphics card (Video RAM?) - can you check it?
It is 512MB. Look at this: