This bug has been reported and no fix was found (in the thread I read).
I can open .vcv files fine by double-clicking them. (They were created before v1.0 but that’s not related to this issue.)
If after opening them, I try to save my changes using either “Save” or “Save as…”, nothing happens. (The menu window closes and it looks as if the file was saved but the file was not saved; changing the filename does not help.)
Same thing happens if I try “Open…”. No error message, nothing, as if I had pressed ESC.
Fix: Copy my .vcv files to a new drive. It seems as if Version 1 doesn’t like dealing with files in Dropbox. Copying to a new Dropbox folder doesn’t help. I never had these problems with Version 0.6.
Hope this helps. 
Christian