Yeah I ran into the same thing this summer. On the original chain the master link went together easily, on the O-ring DID type it wouldn't go at all. I actually bought a new link as I thought the one that came in the pack was defective.
Didn't realize there was such as thing as a clip-type interferance fit, seems to miss the point of having a clip vs a rivet.
I could not make the vice-grip work (didn't know the nut trick), ended up buying a little chain press.