Plt not responding - AD2 white out.

Hi. This is on-going. Open a project, work on it for some time...works okay. Mix down a section, save and close project. Go to open another, select file and freeze...not responding. As I typed this, it came back briefly and I went to open a file and froze again.
 
Yesterday, I was working on a project and AD2 content in the plug-in 'whited' out. First time I've seen this...it simply became a white page...still worked in project though...had to restart Sonar/project and it was back...bizarre.
 
Anyone?
 
Thanks in advance.