Thread:Extension talk:Maps/zoom 11 causes corrupted maps

Setup: fresh install of MW 1.21.1 on Ubuntu 13.04, php 4.4.9, MySQL 5.5.31 with SMW 1.8.0.5, Maps 2.0.1, Validator 0.5.1

A page with the following code works as expected

With zoom=12 or higher IE and Opera show corrupted maps with the map tiles all positioned at the left of the map leaving the right area blank. All markers shown at the left side, too. Firefox does not have this problem. I tried many variations (other OS, php 5.3, several MW 1.20.* isntalls). The problem always appears. Google mapservice works fine for me, it's just Openlayers. Hope someone has a workaround.