Automation issue - Plugin toggles on and off during Export function

I have an automation lane set up on a vocal bus very simply to turn Izotope's "Vinyl" plugin on for two verses of the vocal track, then turn it off.  It works fine during playback within Sonar X3 Studio.
 
But when I do an Export Audio, I can see the the Bypass/On button (on the lower right of the Vinyl plugin gui) toggle back and forth during the "On" period of the automation. It should just be ON and not toggling during these 2 verses, just like it does when doing a playback within Sonar. This on and off can be heard in the exported audio file.  There is also the usual "Bypass" button/indicator on the upper left hand corner, and that one displays status as is should...  on when it should be on, off when it should be off, following the automation properly.  It's the other Bypass/On button that does the toggling. 
 
It never used to do this.  Always seemed to work before.  I downloaded the Vinyl plugin anew, deinstalled the old one and installed the new one just to check, and same problem. 
 
I have H-Delay on the same vocal bus as well, automated...  and it is behaving as it should, following the automation lane. 
 
Any ideas?  I've restarted the computer, redid the plugin, deleted it off the track and reinstated, no joy...  can't think of what can be causing this issue. Especially since it wasn't there in the past.