Suppose that, we have a modal window with two components (text field and text area). Steps to trigger problem:
1. Open modal window, we can input text into text field
2. Close then open modal window again, now we can't input text to text field
This problem only occurs in IE 11 with both wicket 6.xx and 7.xx. In addition, it only happen when showing modal dialog with page.
You can try reproducing problem here: