I can reproduce this bug with 4.1.3.2 running on 64-bit Linux Mint 15 (i.e. Ubuntu 13.04).
Turning anti-aliasing off resolves the issue completely.
I can reproduce this bug with 4.1.3.2 running on 64-bit Linux Mint 15 (i.e. Ubuntu 13.04).
Turning anti-aliasing off resolves the issue completely.