This problem is from the Raphael library.
Raphael seems to lacks on images stripings.
In localhost is works like a charm.
Online it not works anymore.
Then, after lot of tests, it disapears and worked good.
For the moment It seems to be a strange bug, because everyting is nice written, but sometimes bugs.
In order to make a bug report to Raphaël library, please describe your configuration when it happens.
In our hand, it disapear, without any change in the source sode.
Maybe we can desactivate the icons for the moment ...