How to reproduce:

• open http://zkfiddle.org/sample/15fa80c/1-Test-IE-11-bug in IE11 and press Run button
• write something into text box and press enter
  • Now grid is invalidated and number of records in model is reduced by one
• see text box
  • now you are unable to edit text box value
  • if there were more text boxes on this page, all would became unmodifiable
  • text box became modifiable when you click somewhere else and text box loose its focus