I’ve found some (resolved) issues for problems with IE11, but I have a feeling, that Vaadin doesn’t work in IE 11 nearly at all :-(. When trying to access Vaadin Sampler I see only moving progress indicator. In my application doesn’t work d&d on table and some other features.
I can confirm that there are currently some problems with IE11. It seems to be with only a few features though. My own application seems to work so far and the Quicktickets demo too, except for the Sales tab. Other applications like the Sampler doesn’t seem to work at all though.