Sonar 8.5 Producer / Guitar Rig 4 Fatal Error

I’m having trouble and I don’t know what to do about it.  I am now getting an error message any time I open up a project that has Guitar Rig 4 in it.  I have no problems if I open up a new file that doesn't have GR4, but all of my files with GR4  (that worked last week) generate a "fatal error" message and cause Sonar to crash. 
 
I tried opening opening a project from last week in safe mode (pressing down “shift” while opening the project).  I did that, and the project opens if I deselect GR4. But then, as soon as I try to insert GR4, I get the fatal error message.  
 


So I uninstalled Guitar Rig 4 and then reinstalled it.  It works as a stand-alone application, but not with Sonar 8.5.   If I try to insert it into a track I get the fatal error message and I have to close down Sonar.
 
I am using Windows 7 (64 bit).
 
Do you know what I should do?  I’m stuck and I can’t get any work done. 
Thanks.
Don