First off, thanks for developing this app, it's the first well-thought out text editing app for Windows 8 and has been a positive experience so far, as someone coming from Notepad++.
Two apparent bugs:
1. Unable to scroll with word wrap activated. This seems to apply both to clicking and dragging the scroll bar and to the multitouch press and drag your finger interface. This issue goes away when word wrap is deactivated.
2. Unable to ctrl+tab between open documents. With two documents open, holding down ctrl and hitting tab once doesn't activate the other document; holding down ctrl and hitting tab twice activates the other document but it then immediately reverts to the first document.
And two suggestions/requests:
1. Allow interactive multitouch (pinch and zoom style) resizing of font
2. Add support for *.tex files!