Comment 6 for bug 1167036

Aha. That's interesting...
Aside: my gmsh version is 2.5.1 (the one that is installed by 'sudo apt-get install gmsh' on Precise)

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lc = 1/16;

Point(1) = {0, 0, 0, lc};
Point(2) = {1, 0, 0, lc};
Point(3) = {1, 1, 0, lc};
Point(4) = {0, 1, 0, lc};
Line(1) = {1, 2};
Line(2) = {2, 3};
Line(3) = {3, 4};
Line(4) = {4, 1};
Periodic Line {3} = {-1};
Periodic Line {4} = {-2};
Line Loop(5) = {1, 2, 3, 4};
Plane Surface(6) = {5};
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...is it my fault? :-P