I had forgotten about that thread. In my case I have not had a encountered the problem for some time now. So I have nothing to add except darn good memory Brundlefly.  I do remember the reason I posted and the issue. 
 
It turned out to be a zoom issue. CW did change the amount of zoom allowed in the PRV. Don't ask me when though. 

Yes...

I've seen both. I only experienced it once before and it went away quickly...

...but yesterday it was constant during some editing for a client. I didn't know/think to try the zoom buttons for a fix.

I will try this today...

Should I bug this?

Sure enough!

Clicking a zoom button immediately restores alignment.

I have not yet worked where I can see how it holds/applies to opening repeatedly or other clips.

I'll update this when I see some overall uses...

Thanks again!