I just had this happen again, and it looks like maximizing the window clears up the problem.

When I am defining a schema and I type "ref=" or "type=" have a popup list display all available options. As I type the name of the type or ref have the list restrict the items based on the type in.

From within an editor window it would be nice to navigate from a "ref" to the definition of that reference. This would need to handle includes and take me to the correct file. After taking me to the new navigation point a single key sequence to take me back from whence I left would be even...

I just installed Oxygen 4.0, and while opening an XSD the editor hung with a grey screen on editor pane. If there are logs that I can send I would be more than happy to do so. I did take a screen shot if you are interested in that.