When I used QGIS 1.8, I was able to transform polyline layers to polygon layers with the Polygonizer plugin. In QGIS 2.2, this function has been subsumed into the Processing toolbox. Unfortunately, it doesn't seem to work. I see that this problem has come up before (Making polygon from intersecting lines in QGIS using Polygonize or similar?) but hasn't been resolved.

Here's my polyline layer:

input http://www.blackthornecology.ie/wp-content/uploads/2014/05/input.png

And here's what I get when I run the polygonizer function:

input http://www.blackthornecology.ie/wp-content/uploads/2014/05/output.png

Only a fraction of the closed shapes have been successfully closed by the polygonize function.

Can anyone advise on how I might get this to work correctly? As I said, I was able to do this sort of thing with the old Polygonizer plugin, using the slow/old methodology. That doesn't seem to be implemented in the new function in QGIS 2.2. Is there somewhere else I could find it?

Thanks in advance!