Sorry, I'm unable to post screenshots at the moment, but the setup I've used as a test is quite standard.
Im just using the docking ring, docking clamps and the OTAV vehicle with two RCS thruster at the rear.
First I cheat the craft into orbit and click the docking rings decouple node menu option. I then allow the docking ring and the OTAV with the docking clamps still attached to gain a fair bit of distance between them before i begin to perform the docking manuever.
I can see the docking rings magnetic force pull the OTAV towards it. The clamps and the docking ring make what looks like perfect contact but the clamps never locks into the ring and the craft just sits there held slightly by what seems like a magnetic force