Check the demo here: http://unirazz.com/cartodb/cartodb1.html After map is loaded, click on GO button to load cartodb layers. It works in latest browsers excepts IE8-10. If I reduce the length of request then it loads fine otherwise it failed. As per documentation I found that cartodb automatically sends POST request if the length of GET is large. In case of IE8-10 its always using the GET request no matter whats the size of request is.
Also I Found that as on IE8-10 there is limited support of CORS that could be also the cause that layers are not loading correctly.
How can fix it?
The code is simple, just loading layers like this
layer.getSubLayer(0).setSQL("SELECT * FROM cartodb2 where zcta5ce10 in ('" + blueZips.join("','") + "')");
layer.getSubLayer(1).setSQL("SELECT * FROM cartodb2 where zcta5ce10 in ('" + redZips.join("','") + "')");
layer.getSubLayer(2).setSQL("SELECT * FROM cartodb2 where zcta5ce10 in ('" + greenZips.join("','") + "')");