Bruno tested the application in IE and got the error right on the first test. He cant reproduce it afterwards, but its save that we have an issue with IE and the initial opening of an segment. The actual bugfix of the application to wait on the HtmlEditor did not work, since the HtmlEditor remained completely empty.

We assume actually, that the error happens only on the first opened segment after rendering the application. We know that the IE is slow on rendering the HtmlEditor the first time. So we have to test this issue until we see the error.