I have had X2 crashing yesterday and today. Yesterday X2 crashed twice (for no apparent reason), partially hanging so that part of X2 was working. So I was able to do a save-as of my project.
Today X2 just crashed, again for apparent reason. When X2 has crashed no Sonar file dump was produced.
Using Win 7 64Bit
Going to update to a new September 2012 graphics driver tomorrow (current driver 2011), see if it makes any difference.
Also some lower parts of Pro Channel disappeared from view, yesterday and today, leaving a blank spaces.