I just installed ISE Design Suite and tried to open Project Navigator. Instead of Project Navigator, I see a blank window with the words "Clip Host" in the title bar.
This window will be seen if ISE Design Suite is installed to a directory with unicode characters. Unicode characters are double byte (2-byte) characters (e.g. Chinese, Japanese, Korean, etc.)
The Project Navigator does not support unicode characters and will fail to open if installed into a directory containing these characters.
The Install directory and the directory path for an ISE project must contain only alphanumeric characters (A-Z, a-z, 0-9), dashes (-), periods (.), spaces, and underscores (_).